Substituted 4-phenylpiperidines, their preparation and use

ABSTRACT

The present invention provides a compound having the structure: 
     
       
         
         
             
             
         
       
         
         
           
             wherein 
             R 1 , R 2 , R 3 , R 4 , and R 5  are each independently H, halogen, CF 3  or C 1 -C 4  alkyl,
           wherein two or more of R 1 , R 2 , R 3 , R 4 , or R 5  are other than H;   
         
             R 6  is H, OH, or halogen; and 
             B is a substituted or unsubstituted heterobicycle, 
             wherein when R 1  is CF 3 , R 2  is H, R 3  is F, R 4  is H, and R 5  is H, or R 1  is H, R 2  is CF 3 , R 3  is H, R 4  is CF 3 , and R 5  is H, or R 1  is Cl, R 2  is H, R 3  is H, R 4  is F, and R 5  is H, or R 1  is CF 3 , R 2  is H, R 3  is F, R 4  is H, and R 5  is H, or R 1  is CF 3 , R 2  is F, R 3  is H, R 4  is H, and R 5  is H, or R 1  is Cl, R 2  is F, R 3  is H, R 4  is H, and R 5  is H, then B is other than 
           
         
       
    
     
       
         
         
             
             
         
       
     
     or a pharmaceutically acceptable salt thereof.

This application claims the benefit of U.S. Provisional Application No.61/986,578, filed Apr. 30, 2014, the contents of which are herebyincorporated by reference in its entirety.

The invention was made with government support under Grant numbersNS067594 and NS074476 awarded by the National Institutes of Health. Thegovernment has certain rights in the invention.

Throughout this application, certain publications are referenced inparentheses. Full citations for these publications may be foundimmediately preceding the claims. The disclosures of these publicationsin their entireties are hereby incorporated by reference into thisapplication in order to describe more fully the state of the art towhich this invention relates.

BACKGROUND OF THE INVENTION

Age-related macular degeneration (AMD) is the leading cause of blindnessin developed countries. It is estimated that 62.9 million individualsworldwide have the most prevalent atrophic (dry) form of AMD; 8 millionof them are Americans. Due to increasing life expectancy and currentdemographics this number is expected to triple by 2020. There iscurrently no FDA-approved treatment for dry AMD. Given the lack oftreatment and high prevalence, development of drugs for dry AMD is ofupmost importance. Clinically, atrophic AMD represents a slowlyprogressing neurodegenerative disorder in which specialized neurons (rodand cone photoreceptors) die in the central part of the retina calledmacula (1). Histopathological and clinical imaging studies indicate thatphotoreceptor degeneration in dry AMD is triggered by abnormalities inthe retinal pigment epithelium (RPE) that lies beneath photoreceptorsand provides critical metabolic support to these light-sensing neuronalcells. Experimental and clinical data indicate that excessiveaccumulation of cytotoxic autofluorescent lipid-protein-retinoidaggregates (lipofuscin) in the RPE is a major trigger of dry AMD (2-9).In addition to AMD, dramatic accumulation of lipofuscin is the hallmarkof Stargardt Disease (STGD), an inherited form of juvenile-onset maculardegeneration. The major cytotoxic component of RPE lipofuscin ispyridinium bisretinoid A2E (FIG. 1). Additional cytotoxic bisretinoidsare isoA2E, atRAL di-PE, and A2-DHP-PE (40, 41). Formation of A2E andother lipofuscin bisretinoids, such as A2-DHP-PE(A2-dihydropyridine-phosphatidylethanolamine) and atRALdi-PE(all-trans-retinal dimer-phosphatidylethanolamine), begins inphotoreceptor cells in a non-enzymatic manner and can be considered as aby-product of the properly functioning visual cycle.

A2E is a product of condensation of all-trans retinaldehyde withphosphatidyl-ethanolamine which occurs in the retina in a non-enzymaticmanner and, as illustrated in FIG. 4, can be considered a by-product ofa properly functioning visual cycle (10). Light-induced isomerization of11-cis retinaldehyde to its all-trans form is the first step in asignaling cascade that mediates light perception. The visual cycle is achain of biochemical reactions that regenerate visual pigment (11-cisretinaldehyde conjugated to opsin) following exposure to light.

As cytotoxic bisretinoids are formed during the course of a normallyfunctioning visual cycle, partial pharmacological inhibition of thevisual cycle may represent a treatment strategy for dry AMD and otherdisorders characterized by excessive accumulation of lipofuscin (25-27,40, 41).

SUMMARY OF THE INVENTION

The present invention provides a compound having the structure:

-   -   wherein    -   R₁, R₂, R₃, R₄, and R₅ are each independently H, halogen, CF₃ or        C₁-C₄ alkyl,        -   wherein two or more of R₁, R₂, R₃, R₄, or R₅ are other than            H;    -   R₆ is H, OH, or halogen; and    -   B is a substituted or unsubstituted heterobicycle,    -   wherein when R₁ is CF₃, R₂ is H, R₃ is F, R₄ is H, and R₅ is H,        or R₁ is H, R₂ is CF₃, R₃ is H, R₄ is CF₃, and R₅ is H, or R₁ is        Cl, R₂ is H, R₃ is H, R₄ is F, and R₅ is H, or R₁ is CF₃, R₂ is        H, R₃ is F, R₄ is H, and R₅ is H, or R₁ is CF₃, R₂ is F, R₃ is        H, R₄ is H, and R₅ is H, or R₁ is Cl, R₂ is F, R₃ is H, R₄ is H,        and R₅ is H, then B is other than

or a pharmaceutically acceptable salt thereof.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1. Structure of bisretinoid A2E, a cytotoxic component of retinallipofuscin.

FIG. 2. Structure of bisretinoid atRAL di-PE (all-transretinaldimer-phosphatidyl ethanolamine), a cytotoxiccomponent of retinallipofuscin. R1 and R2 refer to various fatty acid constituents.

FIG. 3. Structure of bisretinoid A2-DHP-PE, a cytotoxic component ofretinal lipofuscin.

FIG. 4. Visual cycle and biosynthesis of A2E. A2E biosynthesis beginswhen a portion of all-trans-retinal escapes the visual cycle (yellowbox) and non-enzymatically reacts with phosphatidyl-ethanolamine formingthe A2E precursor, A2-PE. Uptake of serum retinol to the RPE (gray box)fuels the cycle.

FIG. 5. Three-dimensional structure of the RBP4-TTR-retinol complex.Tetrameic TTR is shown in blue, light blue, green and yellow (largeboxed region). RBP is shown in red (unboxed region) and retinol is shownin gray (small boxed region) (28).

FIG. 6. Structure of fenretinide, [N-(4-hydroxy-phenyl)retinamide,4HRP], a retinoid RBP4 antagonist.

FIG. 7. Schematic depiction of the HTRF-based assay format forcharacterization of RBP4 antagonists disrupting retinol-induced RBP4-TTRinteraction.

FIG. 8. Effect of Compound 81 Treatment on Bisretinoid Accumulation inEyes of Abca4−/− mice (P=0.006; unpaired t-test).

FIG. 9. Serum RBP4 Levels in Compound 81- and vehicle-treated Abca4−/−mice.

DETAILED DESCRIPTION OF THE INVENTION

The present invention provides a compound having the structure:

-   -   wherein    -   R₁, R₂, R₃, R₄, and R₅ are each independently H, halogen, CF₃ or        C₁-C₄ alkyl,        -   wherein two or more of R₁, R₂, R₃, R₄, or R₅ are other than            H;    -   R₆ is H, OH, or halogen; and    -   B is a substituted or unsubstituted heterobicycle,    -   wherein when R₁ is CF₃, R₂ is H, R₃ is F, R₄ is H, and R₅ is H,        or R₁ is H, R₂ is CF₃, R₃ is H, R₄ is CF₃, and R₅ is H, or R₁ is        Cl, R₂ is H, R₃ is H, R₄ is F, and R₅ is H, or R₁ is CF₃, R₂ is        H, R₃ is F, R₄ is H, and R₅ is H, or R₁ is CF₃, R₂ is F, R₃ is        H, R₄ is H, and R₅ is H, or R₁ is Cl, R₂ is F, R₃ is H, R₄ is H,        and R₅ is H, then B is other than

or a pharmaceutically acceptable salt thereof.

The present invention also provides a compound having the structure:

-   -   wherein    -   R₁, R₂, R₃, R₄, and R₅ are each independently H, halogen, CF₃ or        C₁-C₄ alkyl,        -   wherein two or more of R₁, R₂, R₃, R₄, or R₅ are other than            H;    -   R₆ is H, OH, or halogen; and    -   B is a substituted or unsubstituted heterobicycle,    -   wherein when R₁ is CF₃, R₂ is H, R₃ is F, R₄ is H, and R₅ is H,        or R₁ is H, R₂ is CF₃, R₃ is H, R₄ is CF₃, and R₅ is H, or R₁ is        Cl, R₂ is H, R₃ is H, R₄ is F, and R₅ is H, or R₁ is CF₃, R₂ is        H, R₃ is F, R₄ is H, and R₅ is H, or R₁ is CF₃, R₂ is F, R₃ is        H, R₄ is H, and R₅ is H, or R₁ is Cl, R₂ is F, R₃ is H, R₄ is H,        and R₅ is H, then B is other than

or a pharmaceutically acceptable salt thereof.

In some embodiment, the compound

-   -   wherein when R₁ is CF₃, R₂ is H, R₃ is F, R₄ is H, and R₅ is H,        or R₁ is H, R₂ is CF₃, R₃ is H, R₄ is CF₃, and R₅ is H, or R₁ is        Cl, R₂ is H, R₃ is H, R₄ is F, and R₅ is H, or R₁ is CF₃, R₂ is        H, R₃ is F, R₄ is H, and R₅ is H, or R₁ is CF₃, R₂ is F, R₃ is        H, R₄ is H, and R₅ is H, or R₁ is Cl, R₂ is F, R₃ is H, R₄ is H,        and R₅ is H, then B is other than

In some embodiment, the compound

-   -   wherein when R₁ is CF₃, R₂ is H, R₃ is F, R₄ is H, and R₅ is H,        or R₁ is H, R₂ is CF₃, R₃ is H, R₄ is CF₃, and R₅ is H, or R₁ is        Cl, R₂ is H, R₃ is H, R₄ is F, and R₅ is H, or R₁ is CF₃, R₂ is        H, R₃ is F, R₄ is H, and R₅ is H, or R₁ is CF₃, R₂ is F, R₃ is        H, R₄ is H, and R₅ is H, or R₁ is Cl, R₂ is F, R₃ is H, R₄ is H,        and R₅ is H, then B is other than

or a pharmaceutically acceptable salt thereof.

In some embodiment, the compound having the structure:

In some embodiment, the compound wherein

-   -   R₁, R₂, R₃, R₄, R₅ and R₆ are each independently H, Cl, F, or        CF₃.

In some embodiment, the compound wherein

-   -   R₁ is CF₃, R₂ is F, R₃ is F, R₄ is H, and R₅ is H, or    -   R₁ is CF₃, R₂ is F, R₃ is H, R₄ is H, and R₅ is H, or    -   R₁ is CF₃, R₂ is F, R₃ is H, R₄ is F, and R₅ is H, or    -   R₁ is CF₃, R₂ is H, R₃ is F, R₄ is F, and R₅ is H, or    -   R₁ is CF₃, R₂ is H, R₃ is H, R₄ is H, and R₅ is F, or    -   R₁ is CF₃, R₂ is H, R₃ is F, R₄ is H, and R₅ is H, or    -   R₁ is CF₃, R₂ is H, R₃ is H, R₄ is Cl, and R₅ is H, or    -   R₁ is CF₃, R₂ is Cl, R₃ is H, R₄ is H, and R₅ is H, or    -   R₁ is H, R₂ is CF₃, R₃ is H, R₄ is CF₃, and R₅ is H, or    -   R₁ is Cl, R₂ is H, R₃ is H, R₄ is F, and R₅ is H, or    -   R₁ is Cl, R₂ is F, R₃ is H, R₄ is H, and R₅ is H.

In some embodiment, the compound wherein B has the structure:

whereinα, β, χ, and δ are each independently absent or present, and whenpresent each is a bond;

X is C or N; Z₁ is N; Z₂ is N or NR₇,

-   -   wherein R₇ is H, C₁-C₄ alkyl, or oxetane;

Q is a substituted or unsubstituted 5, 6, or 7 membered ring structure.

In some embodiment, the compound wherein B has the structure:

whereinwhen α is present, then Z₁ and Z₂ are N, X is N, P is present, and x and6 are absent; andwhen α is absent, then Z₁ is N, Z₂ is N—R₇, X is C, β and δ are present,and x is absent.

In some embodiment, the compound wherein B has the structure:

whereinn is an integer from 0-2;α, β, χ, δ, ε, and φ are each independently absent or present, and whenpresent each is a bond;

Z₁ is N; Z₂ is N or N—R₇,

-   -   wherein R₇ is H, C₁-C₁₀ alkyl, or oxetane;

X is C or N; and

Y₁, Y₂, Y₃, and each occurrence of Y₄ are each independently CR₈, CH₂,or N—R₉,

-   -   wherein    -   R₈ is H, halogen, OCH₃, CN, or CF₃; and    -   R₉ is H, CN, oxetane, C₁-C₆ alkyl, C₃-C₆ cycloalkyl, (C₁-C₄        alkyl)(C₃-C₆ cycloalkyl), (C₁-C₆ alkyl)-OCH₃, (C₁-C₆ alkyl)-CF₃,        C(O)—(C₁-C₆ alkyl), C(O)₂—(C₁-C₆ alkyl), C(O)—NH₂C(O)—NH—(C₁-C₆        alkyl), C(O)—(C₆ aryl), C(O)—(C₆ heteroaryl), C(O)-pyrrolidine,        C(O)-piperidine, C(O)-piperazine, (C₁-C₆ alkyl)-CO₂H, (C₁-C₆        alkyl)-CO₂(C₁-C₆ alkyl) or SO₂—(C₁-C₆ alkyl).

In some embodiment, the compound wherein B has the structure:

whereinn is 0;R₇ is H, C₁-C₄ alkyl, or oxetane;Y₁ and Y₃ are each CH₂; and

Y₂ is N—R₉,

-   -   wherein    -   R₉ is H, CN, oxetane, C₁-C₆ alkyl, C₃-C₆ cycloalkyl, (C₁-C₄        alkyl)(C₃-C₆ cycloalkyl), (C₁-C₅ alkyl)-OCH₃, (C₁-C₆ alkyl)-CF₃,        C(O)—(C₁-C₆ alkyl), C(O)₂—(C₁-C₆ alkyl), C(O)—NH₂C(O)NH—(C₁-C₆        alkyl), C(O)—(C₆ aryl), C(O)—(C₆ heteroaryl), C(O)-pyrrolidine,        C(O)-piperidine, C(O)-piperazine, (C₁-C₆ alkyl)-CO₂H, (C₁-C₆        alkyl)-CO₂(C₁-C₆ alkyl) or SO₂—(C₁-C₆ alkyl).

In some embodiment, the compound wherein B has the structure:

whereinn is 1;R₇ is H, C₁-C₄ alkyl, or oxetane;Y₁, Y₂ and Y₄ are each CH₂; and

Y₃ is N—R₉,

-   -   wherein    -   R₉ is H, CN, oxetane, C₁-C₆ alkyl, C₃-C₆ cycloalkyl, (C₁-C₄        alkyl)(C₃-C₆ cycloalkyl), (C₁-C₆ alkyl)-OCH₃, (C₁-C₆ alkyl)-CF₃,        C(O)—(C₁-C₆ alkyl), C(O)₂—(C₁-C₆ alkyl), C(O)—NH₂C(O)NH—(C₁-C₆        alkyl), C(O)—(C₆ aryl), C(O)—(C₆ heteroaryl), C(O)-pyrrolidine,        C(O)-piperidine, C(O)-piperazine, (C₁-C₆ alkyl)-CO₂H, (C₁-C₆        alkyl)-CO₂(C₁-C₆ alkyl) or SO₂—(C₁-C₆ alkyl).

In some embodiment, the compound wherein B has the structure:

whereinn is 1;R_(v) is H, C₁-C₄ alkyl, or oxetane;Y₁, Y₃ and Y₄ are each CH₂; and

Y₂ is N—R₉,

-   -   wherein    -   R₉ is H, CN, oxetane, C₁-C₆ alkyl, C₃-C₆ cycloalkyl, (C₁-C₄        alkyl)(C₃-C₆ cycloalkyl), (C₁-C₆ alkyl)-OCH₃, (C₁-C₆ alkyl)-CF₃,        C(O)—(C₁-C₆ alkyl), C(O)₂—(C₁-C₆ alkyl), C(O)—NH₂C(O)NH—(C₁-C₆        alkyl), C(O)—(C₆ aryl), C(O)—(C₆ heteroaryl), C(O)-pyrrolidine,        C(O)-piperidine, C(O)-piperazine, (C₁-C₆ alkyl)-CO₂H, (C₁-C₆        alkyl)-CO₂(C₁-C₆ alkyl) or SO₂—(C₁-C₆ alkyl).

In some embodiment, the compound wherein B has the structure:

In some embodiment, the compound wherein

-   -   R₉ is H, CN, CH₃, CH₂CH₃, CH₂CH₂CH₃, CH(CH₃)₂, CH₂CH(CH₃)₂,        t-Bu, CH₂CH(CH₃)₂, CH₂C(CH₃)₃, CH₂CF₃, CH₂CH₂CF₃, CH₂OCH₃,        CH₂CH₂OCH₃,

In some embodiment, the compound wherein

-   -   R₉ is SO₂—CH₃, C(O)—CH₃, C(O)—CH₂CH₃, C(O)—CH₂CH₂CH₃,        C(O)—CH(CH₃)₂, C(O)—CH₂CH(CH₃)₂, C(O)-t-Bu, C(O)—OCH₃,        C(O)—NHCH₃,

In some embodiment, the compound wherein

-   -   R₇ is H, CH₃, CH₂CH₃, CH(CH₃)₂, or

In some embodiment, the compound wherein B has the structure:

-   -   wherein    -   Y₁, Y₂, Y₃ and Y₄ are each independently CR₈ or N,        -   wherein each R₈ is independently H, halogen, OCH₃, CN, or            CF₃.

In some embodiment, the compound wherein B has the structure:

In some embodiment, the compound wherein each R₆ is CN or OCH₃.

In some embodiment, the compound having the structure:

or a pharmaceutically acceptable salt of the compound.

In some embodiment, the compound wherein the structure:

or a pharmaceutically acceptable salt of the compound.

In some embodiment, the compound having the structure:

or a pharmaceutically acceptable salt of the compound.

The present invention provides a pharmaceutical composition comprisingany one of the above compounds and a pharmaceutically acceptablecarrier.

The present invention provides a method for treating a diseasecharacterized by excessive lipofuscin accumulation in the retina in asubject afflicted therewith comprising administering to the subject aneffective amount of any one of the above compounds.

The present invention provides a pharmaceutical composition comprisingthe compound of the present invention and a pharmaceutically acceptablecarrier.

The present invention provides a method for treating a diseasecharacterized by excessive lipofuscin accumulation in the retina in asubject afflicted therewith comprising administering to the subject aneffective amount of the compound of the present invention or acomposition of the present invention.

In some embodiments, the disease is further characterized bybisretinoid-mediated macular degeneration.

In some embodiments, the amount of the compound is effective to lowerthe serum concentration of RBP4 in the subject.

In some embodiments, the amount of the compound is effective to lowerthe retinal concentration of a bisretinoid in lipofuscin in the subject.

In some embodiments, the bisretinoid is A2E. In some embodiments, thebisretinoid is isoA2E. In some embodiments, the bisretinoid isA2-DHP-PE. In some embodiments, the bisretinoid is atRAL di-PE.

In some embodiments, the disease characterized by excessive lipofuscinaccumulation in the retina is Age-Related Macular Degeneration.

In some embodiments, the disease characterized by excessive lipofuscinaccumulation in the retina is dry (atrophic) Age-Related MacularDegeneration.

In some embodiments, the disease characterized by excessive lipofuscinaccumulation in the retina is Stargardt Disease.

In some embodiments, the disease characterized by excessive lipofuscinaccumulation in the retina is Best disease.

In some embodiments, the disease characterized by excessive lipofuscinaccumulation in the retina is adult vitelliform maculopathy.

In some embodiments, the disease characterized by excessive lipofuscinaccumulation in the retina is Stargardt-like macular dystrophy

In some embodiments, the subject is a mammal. In some embodiments, themammal is a human.

In some embodiments, R₉ is H, C₁-C₄ alkyl, C₃-C₆ cycloalkyl, (C₁-C₄alkyl)-CF₃, (C₁-C₆ alkyl)-OCH₃, (C₁-C₄ alkyl)-halogen, SO₂—(C₁-4 alkyl),SO₂—(C₁-C₄ alkyl)-CF₃, SO₂—(C₁-C₄ alkyl)-OCH₃, SO₂—(C₁-C₄alkyl)-halogen, C(O)—(C₁-C₄ alkyl), C(O)—(C₁-C₄ alkyl)-CF₃, C(O)—(C₁-C₄alkyl)-OCH₃, C(O)—(C₁-C₄ alkyl)-halogen, C(O)—NH—(C₁-C₄ alkyl),C(O)—N(C₁-C₄ alkyl)₂, (C₁-C₄ alkyl)-C(O)OH, C(O)—NH₂ or oxetane.

In some embodiments, R₉ is H, CH₃, CH₂CH₃, CH₂CH₂CH₃, CH(CH₃)₂,CH₂CH(CH₃)₂, t-Bu, CH₂OCH₃, CH₂CF₃, CH₂Cl, CH₂F, CH₂CH₂OCH₃, CH₂CH₂CF₃,CH₂CH₂Cl, CH₂CH₂F, or

In some embodiments, R₉ is SO₂—CH₃, SO₂—CH₂CH₃, SO₂—CH₂CH₂CH₃,SO₂—CH(CH₃)₂, SO₂—CH₂CH(CH₃)₂, SO₂-t-Bu, SO₂—CH₂OCH₃, SO₂—CH₂CF₃,SO₂—CH₂Cl, SO₂—CH₂F, SO₂—CH₂CH₂OCH₃, SO₂—CH₂CH₂CF₃, SO₂—CH₂CH₂Cl,SO₂—CH₂CH₂F, or

In some embodiments, R₉ is C(O)—CH₃, C(O)—CH₂CH₃, C(O)—CH₂H₂CH₃,C(O)—CH(CH₃)₂, C(O)—CH₂CH(CH₃)₂, C(O)-t-Bu, C(O)—CH₂OCH₃, C(O)—CH₂CF₃,C(O)—CH₂Cl, C(O)—CH₂F, C(O)—CH₂CH₂OCH₃, C(O)—CH₂CH₂CF₃, C(O)—CH₂CH₂Cl,C(O)—CH₂CH₂F,

In some embodiments, the compound having the structure:

or a pharmaceutically acceptable salt thereof.

In some embodiments of the compound, B has the structure:

The present invention provides a pharmaceutical composition comprising2M a compound of the present invention and a pharmaceutically acceptablecarrier.

The present invention provides a method for treating a diseasecharacterized by excessive lipofuscin accumulation in the retina in amammal afflicted therewith comprising administering to the mammal aneffective amount of a compound of the present invention or a compositionof the present invention

In some embodiments of the method, wherein the disease is furthercharacterized by bisretinoid-mediated macular degeneration.

In some embodiments of the method, wherein the amount of the compound iseffective to lower the serum concentration of RBP4 in the mammal.

In some embodiments of the method, wherein the amount of the compound iseffective to lower the retinal concentration of a bisretinoid inlipofuscin in the mammal.

In some embodiments of the method, wherein the bisretinoid is A2E. Insome embodiments of the method, wherein the bisretinoid is isoA2E. Insome embodiments of the method, wherein the bisretinoid is A2-DHP-PE.

In some embodiments of the method, wherein the bisretinoid is atRALdi-PE.

In some embodiments of the method, wherein the disease characterized byexcessive lipofuscin accumulation in the retina is Age-Related MacularDegeneration.

In some embodiments of the method, wherein the disease characterized byexcessive lipofuscin accumulation in the retina is dry (atrophic)Age-Related Macular Degeneration.

In some embodiments of the method, wherein the disease characterized byexcessive lipofuscin accumulation in the retina is Stargardt Disease.

In some embodiments of the method, wherein the disease characterized byexcessive lipofuscin accumulation in the retina is Best disease.

In some embodiments of the method, wherein the disease characterized byexcessive lipofuscin accumulation in the retina is adult vitelliformmaculopathy.

In some embodiments of the method, wherein the disease characterized byexcessive lipofuscin accumulation in the retina is Stargardt-likemacular dystrophy.

In some embodiments, bisretinoid-mediated macular degeneration isAge-Related Macular Degeneration or Stargardt Disease.

In some embodiments, the bisretinoid-mediated macular degeneration isAge-Related Macular Degeneration.

In some embodiments, the bisretinoid-mediated macular degeneration isdry (atrophic) Age-Related Macular Degeneration.

In some embodiments, the bisretinoid-mediated macular degeneration isStargardt Disease.

In some embodiments, the bisretinoid-mediated macular degeneration isBest disease.

In some embodiments, the bisretinoid-mediated macular degeneration isadult vitelliform maculopathy.

In some embodiments, the bisretinoid-mediated macular degeneration isStargardt-like macular dystrophy.

The bisretinoid-mediated macular degeneration may comprise theaccumulation of lipofuscin deposits in the retinal pigment epithelium.

As used herein, “bisretinoid lipofuscin” is lipofuscin containing acytotoxic bisretinoid. Cytotoxic bisretinoids include but are notnecessarily limited to A2E, isoA2E, atRAL di-PE, and A2-DHP-PE (FIGS. 1,2, and 3).

The present invention provides non-retinol piperidine compoundscomprising a 3,4-difluoro-2-(trifluoromethyl)phenyl moiety. This featuresignificantly increases the potency and improves pharmacokineticcharacteristics of the molecules.

The present invention provides non-retinol piperidine compoundscomprising a 3,5-difluoro-2-(trifluoromethyl)phenyl moiety. This featuresignificantly increases the potency and improves pharmacokineticcharacteristics of the molecules.

The present invention provides non-retinol piperidine compoundscomprising di- or trisubstitued phenyl moiety. This featuresignificantly increases the potency and improves pharmacokineticcharacteristics of the molecules.

Except where otherwise specified, when the structure of a compound ofthis invention includes an asymmetric carbon atom, it is understood thatthe compound occurs as a racemate, racemic mixture, and isolated singleenantiomer. All such isomeric forms of these compounds are expresslyincluded in this invention. Except where otherwise specified, eachstereogenic carbon may be of the R or S configuration. It is to beunderstood accordingly that the isomers arising from such asymmetry(e.g., all enantiomers and diastereomers) are included within the scopeof this invention, unless indicated otherwise. Such isomers can beobtained in substantially pure form by classical separation techniquesand by stereochemically controlled synthesis, such as those described in“Enantiomers, Racemates and Resolutions” by J. Jacques, A. Collet and S.Wilen, Pub. John Wiley & Sons, NY, 1981. For example, the resolution maybe carried out by preparative chromatography on a chiral column.

The subject invention is also intended to include all isotopes of atomsoccurring on the compounds disclosed herein. Isotopes include thoseatoms having the same atomic number but different mass numbers. By wayof general example and without limitation, isotopes of hydrogen includetritium and deuterium. Isotopes of carbon include C-13 and C-14.

It will be noted that any notation of a carbon in structures throughoutthis application, when used without further notation, are intended torepresent all isotopes of carbon, such as ¹²C, ¹³C, or ¹⁴C. Furthermore,any compounds containing ¹³C or ¹⁴C may specifically have the structureof any of the compounds disclosed herein.

It will also be noted that any notation of a hydrogen in structuresthroughout this application, when used without further notation, areintended to represent all isotopes of hydrogen, such as ¹H, ²H, or ³H.Furthermore, any compounds containing ²H or ³H may specifically have thestructure of any of the compounds disclosed herein.

Isotopically-labeled compounds can generally be prepared by conventionaltechniques known to those skilled in the art using appropriateisotopically-labeled reagents in place of the non-labeled reagentsemployed.

The term “substitution”, “substituted” and “substituent” refers to afunctional group as described above in which one or more bonds to ahydrogen atom contained therein are replaced by a bond to non-hydrogenor non-carbon atoms, provided that normal valencies are maintained andthat the substitution results in a stable compound. Substituted groupsalso include groups in which one or more bonds to a carbon(s) orhydrogen(s) atom are replaced by one or more bonds, including double ortriple bonds, to a heteroatom. Examples of substituent groups includethe functional groups described above, and halogens (i.e., F, Cl, Br,and I); alkyl groups, such as methyl, ethyl, n-propyl, isopropryl,n-butyl, tert-butyl, and trifluoromethyl; hydroxyl; alkoxy groups, suchas methoxy, ethoxy, n-propoxy, and isopropoxy; aryloxy groups, such asphenoxy; arylalkyloxy, such as benzyloxy (phenylmethoxy) andp-trifluoromethylbenzyloxy(4-trifluoromethylphenylmethoxy);heteroaryloxy groups; sulfonyl groups, such as trifluoromethanesulfonyl,methanesulfonyl, and p-toluenesulfonyl; nitro, nitrosyl; mercapto;sulfanyl groups, such as methylsulfanyl, ethylsulfanyl andpropylsulfanyl; cyano; amino groups, such as amino, methylamino,dimethylamino, ethylamino, and diethylamino; and carboxyl. Wheremultiple substituent moieties are disclosed or claimed, the substitutedcompound can be independently substituted by one or more of thedisclosed or claimed substituent moieties, singly or plurally. Byindependently substituted, it is meant that the (two or more)substituents can be the same or different.

In the compounds used in the method of the present invention, thesubstituents may be substituted or unsubstituted, unless specificallydefined otherwise.

In the compounds used in the method of the present invention, alkyl,heteroalkyl, monocycle, bicycle, aryl, heteroaryl and heterocycle groupscan be further substituted by replacing one or more hydrogen atoms withalternative non-hydrogen groups. These include, but are not limited to,halo, hydroxy, mercapto, amino, carboxy, cyano and carbamoyl.

It is understood that substituents and substitution patterns on thecompounds used in the method of the present invention can be selected byone of ordinary skill in the art to provide compounds that arechemically stable and that can be readily synthesized by techniquesknown in the art from readily available starting materials. If asubstituent is itself substituted with more than one group, it isunderstood that these multiple groups may be on the same carbon or ondifferent carbons, so long as a stable structure results.

In choosing the compounds used in the method of the present invention,one of ordinary skill in the art will recognize that the varioussubstituents, i.e. R₁, R₂, etc. are to be chosen in conformity withwell-known principles of chemical structure connectivity.

As used herein, “alkyl” is intended to include both branched andstraight-chain saturated aliphatic hydrocarbon groups having thespecified number of carbon atoms. Thus, C₁-C_(n) as in “C₁-C_(n) alkyl”is defined to include groups having 1, 2 . . . , n−1 or n carbons in alinear or branched arrangement, and specifically includes methyl, ethyl,propyl, butyl, pentyl, hexyl, heptyl, isopropyl, isobutyl, sec-butyl andso on. An embodiment can be C₁-C₁₂ alkyl, C₂-C₁₂ alkyl, C₃-C₁₂ alkyl,C₄-C₁₂ alkyl and so on. An embodiment can be C₁-C₈ alkyl, C₂-C₈ alkyl,C₃-C₈ alkyl, C₄-C₈ alkyl and so on. “Alkoxy” represents an alkyl groupas described above attached through an oxygen bridge.

The term “alkenyl” refers to a non-aromatic hydrocarbon radical,straight or branched, containing at least 1 carbon to carbon doublebond, and up to the maximum possible number of non-aromaticcarbon-carbon double bonds may be present. Thus, C₂-C_(n) alkenyl isdefined to include groups having 1, 2 . . . , n−1 or n carbons. Forexample, “C₂-C₆ alkenyl” means an alkenyl radical having 2, 3, 4, 5, or6 carbon atoms, and at least 1 carbon-carbon double bond, and up to, forexample, 3 carbon-carbon double bonds in the case of a C₆ alkenyl,respectively. Alkenyl groups include ethenyl, propenyl, butenyl andcyclohexenyl. As described above with respect to alkyl, the straight,branched or cyclic portion of the alkenyl group may contain double bondsand may be substituted if a substituted alkenyl group is indicated. Anembodiment can be C₂-C₁₂ alkenyl or C₂-C₈ alkenyl.

The term “alkynyl” refers to a hydrocarbon radical straight or branched,containing at least 1 carbon to carbon triple bond, and up to themaximum possible number of non-aromatic carbon-carbon triple bonds maybe present. Thus, C₂-C_(n) alkynyl is defined to include groups having1, 2 . . . , n−1 or n carbons. For example, “C₂-C₆ alkynyl” means analkynyl radical having 2 or 3 carbon atoms, and 1 carbon-carbon triplebond, or having 4 or 5 carbon atoms, and up to 2 carbon-carbon triplebonds, or having 6 carbon atoms, and up to 3 carbon-carbon triple bonds.Alkynyl groups include ethynyl, propynyl and butynyl. As described abovewith respect to alkyl, the straight or branched portion of the alkynylgroup may contain triple bonds and may be substituted if a substitutedalkynyl group is indicated. An embodiment can be a C₂-C_(n) alkynyl. Anembodiment can be C₂-C₁₂ alkynyl or C₃-C₈ alkynyl.

Alkyl groups can be unsubstituted or substituted with one or moresubstituents, including but not limited to halogen, alkoxy, alkylthio,trifluoromethyl, difluoromethyl, methoxy, and hydroxyl.

As used herein, “C₁-C₄ alkyl” includes both branched and straight-chainC₁-C₄ alkyl.

As used herein, “heteroalkyl” includes both branched and straight-chainsaturated aliphatic hydrocarbon groups having at least 1 heteroatomwithin the chain or branch.

As used herein, “cycloalkyl” includes cyclic rings of alkanes of threeto eight total carbon atoms, or any number within this range (i.e.,cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl orcyclooctyl).

As used herein, “heterocycloalkyl” is intended to mean a 5- to10-membered nonaromatic ring containing from 1 to 4 heteroatoms selectedfrom the group consisting of O, N and S, and includes bicyclic groups.“Heterocyclyl” therefore includes, but is not limited to the following:imidazolyl, piperazinyl, piperidinyl, pyrrolidinyl, morpholinyl,thiomorpholinyl, tetrahydropyranyl, dihydropiperidinyl,tetrahydrothiophenyl and the like. If the heterocycle contains nitrogen,it is understood that the corresponding N-oxides thereof are alsoencompassed by this definition.

As used herein, “aryl” is intended to mean any stable monocyclic,bicyclic or polycyclic carbon ring of up to 10 atoms in each ring,wherein at least one ring is aromatic, and may be unsubstituted orsubstituted. Examples of such aryl elements include but are not limitedto: phenyl, p-toluenyl(4-methylphenyl), naphthyl, tetrahydro-naphthyl,indanyl, phenanthryl, anthryl or acenaphthyl. In cases where the arylsubstituent is bicyclic and one ring is non-aromatic, it is understoodthat attachment is via the aromatic ring.

The term “alkylaryl” refers to alkyl groups as described above whereinone or more bonds to hydrogen contained therein are replaced by a bondto an aryl group as described above. It is understood that an“alkylaryl” group is connected to a core molecule through a bond fromthe alkyl group and that the aryl group acts as a substituent on thealkyl group. Examples of arylalkyl moieties include, but are not limitedto, benzyl (phenylmethyl),p-trifluoromethylbenzyl(4-trifluoromethylphenylmethyl), 1-phenylethyl,2-phenylethyl, 3-phenylpropyl, 2-phenylpropyl and the like.

The term “heteroaryl” as used herein, represents a stable monocyclic,bicyclic or polycyclic ring of up to 10 atoms in each ring, wherein atleast one ring is aromatic and contains from 1 to 4 heteroatoms selectedfrom the group consisting of O, N and S. Bicyclic aromatic heteroarylgroups include but are not limited to phenyl, pyridine, pyrimidine orpyridizine rings that are (a) fused to a 6-membered aromatic(unsaturated) heterocyclic ring having one nitrogen atom; (b) fused to a5- or 6-membered aromatic (unsaturated) heterocyclic ring having twonitrogen atoms; (c) fused to a 5-membered aromatic (unsaturated)heterocyclic ring having one nitrogen atom together with either oneoxygen or one sulfur atom; or (d) fused to a 5-membered aromatic(unsaturated) heterocyclic ring having one heteroatom selected from O, Nor S. Heteroaryl groups within the scope of this definition include butare not limited to: benzoimidazolyl, benzofuranyl, benzofurazanyl,benzopyrazolyl, benzotriazolyl, benzothiophenyl, benzoxazolyl,carbazolyl, carbolinyl, cinnolinyl, furanyl, indolinyl, indolyl,indolazinyl, indazolyl, isobenzofuranyl, isoindolyl, isoquinolyl,isothiazolyl, isoxazolyl, naphthpyridinyl, oxadiazolyl, oxazolyl,oxazoline, isoxazoline, oxetanyl, pyranyl, pyrazinyl, pyrazolyl,pyridazinyl, pyridopyridinyl, pyridazinyl, pyridyl, pyrimidyl, pyrrolyl,quinazolinyl, quinolyl, quinoxalinyl, tetrazolyl, tetrazolopyridyl,thiadiazolyl, thiazolyl, thienyl, triazolyl, azetidinyl, aziridinyl,1,4-dioxanyl, hexahydroazepinyl, dihydrobenzoimidazolyl,dihydrobenzofuranyl, dihydrobenzothiophenyl, dihydrobenzoxazolyl,dihydrofuranyl, dihydroimidazolyl, dihydroindolyl, dihydroisooxazolyl,dihydroisothiazolyl, dihydrooxadiazolyl, dihydrooxazolyl,dihydropyrazinyl, dihydropyrazolyl, dihydropyridinyl,dihydropyrimidinyl, dihydropyrrolyl, dihydroquinolinyl,dihydrotetrazolyl, dihydrothiadiazolyl, dihydrothiazolyl,dihydrothienyl, dihydrotriazolyl, dihydroazetidinyl,methylenedioxybenzoyl, tetrahydrofuranyl, tetrahydrothienyl, acridinyl,carbazolyl, cinnolinyl, quinoxalinyl, pyrrazolyl, indolyl,benzotriazolyl, benzothiazolyl, benzoxazolyl, isoxazolyl, isothiazolyl,furanyl, thienyl, benzothienyl, benzofuranyl, quinolinyl, isoquinolinyl,oxazolyl, isoxazolyl, indolyl, pyrazinyl, pyridazinyl, pyridinyl,pyrimidinyl, pyrrolyl, tetra-hydroquinoline. In cases where theheteroaryl substituent is bicyclic and one ring is non-aromatic orcontains no heteroatoms, it is understood that attachment is via thearomatic ring or via the heteroatom containing ring, respectively. Ifthe heteroaryl contains nitrogen atoms, it is understood that thecorresponding N-oxides thereof are also encompassed by this definition.

As used herein, “monocycle” includes any stable polycyclic carbon ringof up to 10 atoms and may be unsubstituted or substituted. Examples ofsuch non-aromatic monocycle elements include but are not limited to:cyclobutyl, cyclopentyl, cyclohexyl, and cycloheptyl. Examples of sucharomatic monocycle elements include but are not limited to: phenyl. Asused herein, “heteromonocycle” includes any monocycle containing atleast one heteroatom.

As used herein, “bicycle” includes any stable polycyclic carbon ring ofup to 10 atoms that is fused to a polycyclic carbon ring of up to 10atoms with each ring being independently unsubstituted or substituted.Examples of such non-aromatic bicycle elements include but are notlimited to: decahydronaphthalene. Examples of such aromatic bicycleelements include but are not limited to: naphthalene. As used herein,“heterobicycle” includes any bicycle containing at least one heteroatom.

The term “phenyl” is intended to mean an aromatic six membered ringcontaining six carbons, and any substituted derivative thereof.

The term “benzyl” is intended to mean a methylene attached directly to abenzene ring. A benzyl group is a methyl group wherein a hydrogen isreplaced with a phenyl group, and any substituted derivative thereof.

The term “pyridine” is intended to mean a heteroaryl having asix-membered ring containing 5 carbon atoms and 1 nitrogen atom, and anysubstituted derivative thereof.

The term “pyrazole” is intended to mean a heteroaryl having afive-membered ring containing three carbon atoms and two nitrogen atomswherein the nitrogen atoms are adjacent to each other, and anysubstituted derivative thereof.

The term “indole” is intended to mean a heteroaryl having afive-membered ring fused to a phenyl ring with the five-membered ringcontaining 1 nitrogen atom directly attached to the phenyl ring.

The term “oxatane” is intended to mean a non-aromatic four-membered ringcontaining three carbon atoms and one oxygen atom, and any substitutedderivative thereof.

The compounds used in the method of the present invention may beprepared by techniques well know in organic synthesis and familiar to apractitioner ordinarily skilled in the art. However, these may not bethe only means by which to synthesize or obtain the desired compounds.

The compounds of present invention may be prepared by techniquesdescribed in Vogel's Textbook of Practical Organic Chemistry, A. I.Vogel, A. R. Tatchell, B. S. Furnis, A. J. Hannaford, P. W. G. Smith,(Prentice Hall) 5^(th) Edition (1996), March's Advanced OrganicChemistry: Reactions, Mechanisms, and Structure, Michael B. Smith, JerryMarch, (Wiley-Interscience) 5^(th) Edition (2007), and referencestherein, which are incorporated by reference herein. However, these maynot be the only means by which to synthesize or obtain the desiredcompounds.

The compounds of present invention may be prepared by techniquesdescribed herein. The synthetic methods used to prepare Examples 1-103are used to prepare additional piperidine compounds which are describedin the embodiments herein.

The various R groups attached to the aromatic rings of the compoundsdisclosed herein may be added to the rings by standard procedures, forexample those set forth in Advanced Organic Chemistry: Part B:

Reaction and Synthesis, Francis Carey and Richard Sundberg, (Springer)5th ed. Edition. (2007), the content of which is hereby incorporated byreference.

Another aspect of the invention comprises a compound of the presentinvention as a pharmaceutical composition.

As used herein, the term “pharmaceutically active agent” means anysubstance or compound suitable for administration to a subject andfurnishes biological activity or other direct effect in the treatment,cure, mitigation, diagnosis, or prevention of disease, or affects thestructure or any function of the subject. Pharmaceutically active agentsinclude, but are not limited to, substances and compounds described inthe Physicians' Desk Reference (PDR Network, LLC; 64th edition; Nov. 15,2009) and “Approved Drug Products with Therapeutic EquivalenceEvaluations” (U.S. Department Of Health And Human Services, 30^(th)edition, 2010), which are hereby incorporated by reference.Pharmaceutically active agents which have pendant carboxylic acid groupsmay be modified in accordance with the present invention using standardesterification reactions and methods readily available and known tothose having ordinary skill in the art of chemical synthesis. Where apharmaceutically active agent does not possess a carboxylic acid group,the ordinarily skilled artisan will be able to design and incorporate acarboxylic acid group into the pharmaceutically active agent whereesterification may subsequently be carried out so long as themodification does not interfere with the pharmaceutically active agent'sbiological activity or effect.

The compounds of the present invention may be in a salt form. As usedherein, a “salt” is a salt of the instant compounds which has beenmodified by making acid or base salts of the compounds. In the case ofcompounds used to treat a disease, the salt is pharmaceuticallyacceptable. Examples of pharmaceutically acceptable salts include, butare not limited to, mineral or organic acid salts of basic residues suchas amines; alkali or organic salts of acidic residues such as phenols.The salts can be made using an organic or inorganic acid. Such acidsalts are chlorides, bromides, sulfates, nitrates, phosphates,sulfonates, formates, tartrates, maleates, malates, citrates, benzoates,salicylates, ascorbates, and the like. Phenolate salts are the alkalineearth metal salts, sodium, potassium or lithium. The term“pharmaceutically acceptable salt” in this respect, refers to therelatively non-toxic, inorganic and organic acid or base addition saltsof compounds of the present invention. These salts can be prepared insitu during the final isolation and purification of the compounds of theinvention, or by separately reacting a purified compound of theinvention in its free base or free acid form with a suitable organic orinorganic acid or base, and isolating the salt thus formed.Representative salts include the hydrobromide, hydrochloride, sulfate,bisulfate, phosphate, nitrate, acetate, valerate, oleate, palmitate,stearate, laurate, benzoate, lactate, phosphate, tosylate, citrate,maleate, fumarate, succinate, tartrate, napthylate, mesylate,glucoheptonate, lactobionate, and laurylsulphonate salts and the like.(See, e.g., Berge et al. (1977) “Pharmaceutical Salts”, J. Pharm. Sci.66:1-19).

A salt or pharmaceutically acceptable salt is contemplated for allcompounds disclosed herein. In some embodiments, a pharmaceuticallyacceptable salt or salt of any of the above compounds of the presentinvention.

As used herein, “treating” means preventing, slowing, halting, orreversing the progression of a disease or infection. Treating may alsomean improving one or more symptoms of a disease or infection.

The compounds of the present invention may be administered in variousforms, including those detailed herein. The treatment with the compoundmay be a component of a combination therapy or an adjunct therapy, i.e.the subject or patient in need of the drug is treated or given anotherdrug for the disease in conjunction with one or more of the instantcompounds. This combination therapy can be sequential therapy where thepatient is treated first with one drug and then the other or the twodrugs are given simultaneously. These can be administered independentlyby the same route or by two or more different routes of administrationdepending on the dosage forms employed.

As used herein, a “pharmaceutically acceptable carrier” is apharmaceutically acceptable solvent, suspending agent or vehicle, fordelivering the instant compounds to the animal or human. The carrier maybe liquid or solid and is selected with the planned manner ofadministration in mind. Liposomes are also a pharmaceutically acceptablecarrier.

The dosage of the compounds administered in treatment will varydepending upon factors such as the pharmacodynamic characteristics of aspecific chemotherapeutic agent and its mode and route ofadministration; the age, sex, metabolic rate, absorptive efficiency,health and weight of the recipient; the nature and extent of thesymptoms; the kind of concurrent treatment being administered; thefrequency of treatment with; and the desired therapeutic effect.

A dosage unit of the compounds used in the method of the presentinvention may comprise a single compound or mixtures thereof withadditional agents. The compounds can be administered in oral dosageforms as tablets, capsules, pills, powders, granules, elixirs,tinctures, suspensions, syrups, and emulsions. The compounds may also beadministered in intravenous (bolus or infusion), intraperitoneal,subcutaneous, or intramuscular form, or introduced directly, e.g. byinjection, topical application, or other methods, into or onto a site ofinfection, all using dosage forms well known to those of ordinary skillin the pharmaceutical arts.

The compounds used in the method of the present invention can beadministered in admixture with suitable pharmaceutical diluents,extenders, excipients, or carriers (collectively referred to herein as apharmaceutically acceptable carrier) suitably selected with respect tothe intended form of administration and as consistent with conventionalpharmaceutical practices. The unit will be in a form suitable for oral,rectal, topical, intravenous or direct injection or parenteraladministration. The compounds can be administered alone or mixed with apharmaceutically acceptable carrier. This carrier can be a solid orliquid, and the type of carrier is generally chosen based on the type ofadministration being used. The active agent can be co-administered inthe form of a tablet or capsule, liposome, as an agglomerated powder orin a liquid form. Examples of suitable solid carriers include lactose,sucrose, gelatin and agar. Capsule or tablets can be easily formulatedand can be made easy to swallow or chew; other solid forms includegranules, and bulk powders. Tablets may contain suitable binders,lubricants, diluents, disintegrating agents, coloring agents, flavoringagents, flow-inducing agents, and melting agents. Examples of suitableliquid dosage forms include solutions or suspensions in water,pharmaceutically acceptable fats and oils, alcohols or other organicsolvents, including esters, emulsions, syrups or elixirs, suspensions,solutions and/or suspensions reconstituted from non-effervescentgranules and effervescent preparations reconstituted from effervescentgranules.

Such liquid dosage forms may contain, for example, suitable solvents,preservatives, emulsifying agents, suspending agents, diluents,sweeteners, thickeners, and melting agents. Oral dosage forms optionallycontain flavorants and coloring agents. Parenteral and intravenous formsmay also include minerals and other materials to make them compatiblewith the type of injection or delivery system chosen.

Techniques and compositions for making dosage forms useful in thepresent invention are described in the following references: 7 ModernPharmaceutics, Chapters 9 and 10 (Banker & Rhodes, Editors, 1979);Pharmaceutical Dosage Forms: Tablets (Lieberman et al., 1981); Ansel,Introduction to Pharmaceutical Dosage Forms 2nd Edition (1976);Remington's Pharmaceutical Sciences, 17th ed. (Mack Publishing Company,Easton, Pa., 1985); Advances in Pharmaceutical Sciences (DavidGanderton, Trevor Jones, Eds., 1992); Advances in PharmaceuticalSciences Vol. 7. (David Ganderton, Trevor Jones, James McGinity, Eds.,1995); Aqueous Polymeric Coatings for Pharmaceutical Dosage Forms (Drugsand the Pharmaceutical Sciences, Series 36 (James McGinity, Ed., 1989);Pharmaceutical Particulate Carriers: Therapeutic Applications: Drugs andthe Pharmaceutical Sciences, Vol 61 (Alain Rolland, Ed., 1993); DrugDelivery to the Gastrointestinal Tract (Ellis Horwood Books in theBiological Sciences. Series in Pharmaceutical Technology; J. G. Hardy,S. S. Davis, Clive G. Wilson, Eds.); Modern Pharmaceutics Drugs and thePharmaceutical Sciences, Vol 40 (Gilbert S. Banker, Christopher T.Rhodes, Eds.). All of the aforementioned publications are incorporatedby reference herein.

Tablets may contain suitable binders, lubricants, disintegrating agents,coloring agents, flavoring agents, flow-inducing agents, and meltingagents. For instance, for oral administration in the dosage unit form ofa tablet or capsule, the active drug component can be combined with anoral, non-toxic, pharmaceutically acceptable, inert carrier such aslactose, gelatin, agar, starch, sucrose, glucose, methyl cellulose,magnesium stearate, dicalcium phosphate, calcium sulfate, mannitol,sorbitol and the like. Suitable binders include starch, gelatin, naturalsugars such as glucose or beta-lactose, corn sweeteners, natural andsynthetic gums such as acacia, tragacanth, or sodium alginate,carboxymethylcellulose, polyethylene glycol, waxes, and the like.Lubricants used in these dosage forms include sodium oleate, sodiumstearate, magnesium stearate, sodium benzoate, sodium acetate, sodiumchloride, and the like. Disintegrators include, without limitation,starch, methyl cellulose, agar, bentonite, xanthan gum, and the like.

The compounds used in the method of the present invention may also beadministered in the form of liposome delivery systems, such as smallunilamellar vesicles, large unilamallar vesicles, and multilamellarvesicles. Liposomes can be formed from a variety of phospholipids, suchas cholesterol, stearylamine, or phosphatidylcholines. The compounds maybe administered as components of tissue-targeted emulsions.

The compounds used in the method of the present invention may also becoupled to soluble polymers as targetable drug carriers or as a prodrug.Such polymers include polyvinylpyrrolidone, pyran copolymer,polyhydroxylpropylmethacrylamide-phenol,polyhydroxyethylasparta-midephenol, or polyethyleneoxide-polylysinesubstituted with palmitoyl residues. Furthermore, the compounds may becoupled to a class of biodegradable polymers useful in achievingcontrolled release of a drug, for example, polylactic acid, polyglycolicacid, copolymers of polylactic and polyglycolic acid, polyepsiloncaprolactone, polyhydroxy butyric acid, polyorthoesters, polyacetals,polydihydropyrans, polycyanoacylates, and crosslinked or amphipathicblock copolymers of hydrogels.

Gelatin capsules may contain the active ingredient compounds andpowdered carriers, such as lactose, starch, cellulose derivatives,magnesium stearate, stearic acid, and the like. Similar diluents can beused to make compressed tablets. Both tablets and capsules can bemanufactured as immediate release products or as sustained releaseproducts to provide for continuous release of medication over a periodof hours. Compressed tablets can be sugar coated or film coated to maskany unpleasant taste and protect the tablet from the atmosphere, orenteric coated for selective disintegration in the gastrointestinaltract.

For oral administration in liquid dosage form, the oral drug componentsare combined with any oral, non-toxic, pharmaceutically acceptable inertcarrier such as ethanol, glycerol, water, and the like. Examples ofsuitable liquid dosage forms include solutions or suspensions in water,pharmaceutically acceptable fats and oils, alcohols or other organicsolvents, including esters, emulsions, syrups or elixirs, suspensions,solutions and/or suspensions reconstituted from non-effervescentgranules and effervescent preparations reconstituted from effervescentgranules. Such liquid dosage forms may contain, for example, suitablesolvents, preservatives, emulsifying agents, suspending agents,diluents, sweeteners, thickeners, and melting agents.

Liquid dosage forms for oral administration can contain coloring andflavoring to increase patient acceptance. In general, water, a suitableoil, saline, aqueous dextrose (glucose), and related sugar solutions andglycols such as propylene glycol or polyethylene glycols are suitablecarriers for parenteral solutions. Solutions for parenteraladministration preferably contain a water soluble salt of the activeingredient, suitable stabilizing agents, and if necessary, buffersubstances. Antioxidizing agents such as sodium bisulfite, sodiumsulfite, or ascorbic acid, either alone or combined, are suitablestabilizing agents. Also used are citric acid and its salts and sodiumEDTA. In addition, parenteral solutions can contain preservatives, suchas benzalkonium chloride, methyl- or propyl-paraben, and chlorobutanol.Suitable pharmaceutical carriers are described in Remington'sPharmaceutical Sciences, Mack Publishing Company, a standard referencetext in this field.

The compounds used in the method of the present invention may also beadministered in intranasal form via use of suitable intranasal vehicles,or via transdermal routes, using those forms of transdermal skin patcheswell known to those of ordinary skill in that art. To be administered inthe form of a transdermal delivery system, the dosage administrationwill generally be continuous rather than intermittent throughout thedosage regimen.

Parenteral and intravenous forms may also include minerals and othermaterials to make them compatible with the type of injection or deliverysystem chosen.

Each embodiment disclosed herein is contemplated as being applicable toeach of the other disclosed embodiments. Thus, all combinations of thevarious elements described herein are within the scope of the invention.

This invention will be better understood by reference to theExperimental Details which follow, but those skilled in the art willreadily appreciate that the specific experiments detailed are onlyillustrative of the invention as described more fully in the claimswhich follow thereafter.

Experimental Details Materials and Methods

TR-FRET assay for retinol-induced RBP4-TTR interaction Binding of adesired RBP4 antagonist displaces retinol and induces hindrance forRBP4-TTR interaction resulting in the decreased FRET signal (FIG. 7).Bacterially expressed MBP-RBP4 and untagged TTR were used in this assay.For the use in the TR-FRET assay the maltose binding protein(MBP)-tagged human RBP4 fragment (amino acids 19-201) was expressed inthe Gold(DE3)pLysS E. coli strain (Stratagene) using the pMAL-c4xvector. Following cell lysis, recombinant RBP4 was purified from thesoluble fraction using the ACTA FPLC system (GE Healthcare) equippedwith the 5-ml the MBP Trap HP column. Human untagged TTR was purchasedfrom Calbiochem. Untagged TTR was labeled directly with Eu³⁺Cryptate-NHS using the HTRF Cryptate Labeling kit from CisBio followingthe manufacturer's recommendations. HTRF assay was performed in whitelow volume 384 well plates (Greiner-Bio) in a final assay volume of 16μl per well. The reaction buffer contained 10 mM Tris-HCl pH 7.5, 1 mMDTT, 0.05% NP-40, 0.05% Prionex, 6% glycerol, and 400 mM KF. Eachreaction contained 60 nM MBP-RBP4 and 2 nM TTR-Eu along with 26.7 nM ofanti-MBP antibody conjugated with d2 (Cisbio). Titration of testcompounds in this assay was conducted in the presence of 1 μM retinol.All reactions were assembled in the dark under dim red light andincubated overnight at +4° C. wrapped in aluminum foil. TR-FRET signalwas measured in the SpectraMax M5e Multimode Plate Reader (MolecularDevice). Fluorescence was excited at 337 nm and two readings per wellwere taken: Reading 1 for time-gated energy transfer from Eu(K) to d2(337 nm excitation, 668 nm emission, counting delay 75 microseconds,counting window 100 microseconds) and Reading 2 for Eu(K) time-gatedfluorescence (337 nm excitation, 620 nm emission, counting delay 400microseconds, counting window 400 microseconds). The TR-FRET signal wasexpressed as the ratio of fluorescence intensity: Flu₆₆₅/Flu₆₂₀×10,000.

Scintillation Proximity RBP4 Binding Assay

Untagged human RBP4 purified from urine of tubular proteinuria patientswas purchased from Fitzgerald Industries International. It wasbiotinylated using the EZ-Link Sulfo-NHS-LC-Biotinylation kit fromPierce following the manufacturer's recommendations. Binding experimentswere performed in 96-well plates (OptiPlate, PerkinElmer) in a finalassay volume of 100 μl per well in SPA buffer (IX PBS, pH 7.4, 1 mMEDTA, 0.1% BSA, 0.5% CHAPS). The reaction mix contained 10 nM ³H-Retinol(48.7 Ci/mmol; PerkinElmer), 0.3 mg/well Streptavidin-PVT beads, 50 nMbiotinylated RBP4 and a test compound. Nonspecific binding wasdetermined in the presence of 20 μM of unlabeled retinol. The reactionmix was assembled in the dark under dim red light. The plates weresealed with clear tape (TopSeal-A: 96-well microplate, PerkinElmer),wrapped in the aluminum foil, and allowed to equilibrate 6 hours at roomtemperature followed by overnight incubation at +4° C. Radiocounts weremeasured using a TopCount NXT counter (Packard Instrument Company).

General Procedure (GP) for Preparing Intermediates for Synthesis ofPiperidine Compounds

Conditions: A1) carboxylic acid, HBTU, Et₃N, DMF; A2) carboxylic acid,EDCI, HOBt, i-Pr₂NEt, DMF; A3) acid chloride, Et₃N, CH₂Cl₂.

General Procedure (GP-A1) for Carboxamide Formation

A mixture of amine I (1 equiv), desired carboxylic acid (1 equiv),triethylamine (Et₃N) (3 equiv), and2-(1H-benzotriazole-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate(HBTU) (1.5 equiv) in DMF (0.25 M) was stirred at room temperature untilthe reaction was complete by LC-MS. The mixture was diluted with H₂O andextracted with EtOAc. The combined organic extracts were washed withH₂O, brine, dried over Na₂SO₄, filtered and concentrated underreduced-pressure. The resulting residue was purified by silica gelchromatography (typical eluents included either a mixture of or hexanesand EtOAc or a mixture of CH₂Cl₂ and a 90:9:1 mixture ofCH₂Cl₂/CH₃OH/concentrated NH₄OH) to afford the desired carboxamide II.The product structure was verified by ¹H NMR and by mass analysis.

General Procedure (GP-A2) for Carboxamide Formation

A mixture of amine I (1 equiv), desired carboxylic acid (1 equiv),N,N-diisopropylethylamine (i-Pr₂NEt) (3 equiv),1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDCI) (1.5 equiv) andhydroxybenzotriazole (HOBt) (1.5 equiv) in DMF (0.25 M) was stirred atroom temperature until the reaction was complete by LC-MS. The mixturewas diluted with H₂O and extracted with EtOAc. The combined organicextracts were washed with H₂O, brine, dried over Na₂SO₄, filtered andconcentrated under reduced pressure. The resulting residue was purifiedby silica gel chromatography (typical eluents included either a mixtureof or hexanes and EtOAc or a mixture of CH₂Cl₂ and a 90:9:1 mixture ofCH₂Cl₂/CH₃OH/concentrated NH₄OH) to afford the desired carboxamide II.The product structure was verified by ¹H NMR and by mass analysis.

General Procedure (GP-A3) for Carboxamide Formation

A mixture of amine I (1 equiv), Et₃N (3 equiv), and acid chloride (1equiv) in CH₂Cl₂ (0.25 M) was stirred at ambient temperature until thereaction was complete by LC-MS. The mixture was washed with H₂O, brine,dried over Na₂SO₄, filtered and concentrated under reduced pressure. Theresulting residue was purified by silica gel chromatography (typicaleluents included either a mixture of or hexanes and EtOAc or a mixtureof CH₂Cl₂ and a 90:9:1 mixture of CH₂Cl₂/CH₃OH/concentrated NH₄OH) toafford the desired carboxamides II. The product structure was verifiedby ¹H NMR and by mass analysis.

General Procedures for Preparing(4-Phenylpiperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneCarboxamides IV

Conditions: B) acid chloride, Et₃N, CH₂Cl₂.

General Procedure (GP-B) for Carboxamide Formation

A mixture of amine III (1 equiv), desired acid chloride (1 equiv) andtriethylamine (Et₃N) (3 equiv) in CH₂Cl₂ (0.25 M) was stirred from 0° C.to room temperature until the reaction was complete by LC-MS. Themixture was diluted with H₂O and extracted with CH₂Cl₂. The combinedorganic extracts were washed with H₂O, brine, dried over Na₂SO₄,filtered and concentrated under reduced pressure. The resulting residuewas purified by silica gel chromatography (typical eluents includedeither a mixture of or hexanes and EtOAc or a mixture of CH₂Cl₂ and a90:9:1 mixture of CH₂Cl₂/CH₃OH/concentrated NH₄OH) to afford the desiredcarboxamides IV. The product structure was verified by ¹H NMR and bymass analysis.

General Procedures for Preparing(4-Phenylpiperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneSulfonamides V

Conditions: C) sulfonyl chloride, i-Pr₂NEt, CH₂Cl₂.

General Procedure (GP-C) for Sulfonamide Formation

A mixture of amine III (1 equiv), desired sulfonyl chloride (1 equiv)and i-Pr₂NEt (3 equiv) in CH₂Cl₂ (0.25 M) was stirred from 0° C. to roomtemperature until the reaction was complete by LC-MS. The mixture wasdiluted with H₂O and extracted with CH₂Cl₂. The combined organicextracts were washed with H₂O, brine, dried over Na₂SO₄, filtered andconcentrated under reduced pressure. The resulting residue was purifiedby silica gel chromatography (typical eluents included either a mixtureof or hexanes and EtOAc or a mixture of CH₂Cl₂ and a 90:9:1 mixture ofCH₂Cl₂/CH₃OH/concentrated NH₄OH) to afford the desired sulfonamides V.The product structure was verified by ¹H NMR and by mass analysis.

General Procedures for Preparing Alkylated(4-Phenylpiperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonesVI

Conditions: D) aldehyde or ketone, NaBH(OAc)₃, CH₂Cl₂.

General Procedure (GP-D) for Sulfonamide Formation

A mixture of amine III (1 equiv), desired aldehyde or ketone (1.5 equiv)and HOAc (6 equiv) in CH₂Cl₂ (0.25 M) was stirred for 16 hours at roomtemperature. To this was added sodium triacetoxyborohydride (NaBH(OAc)₃)and the mixture stirred at room temperature until the reaction wascomplete by LC-MS. The mixture was diluted with aqueous, saturatedNaHCO₃ solution and extracted with CH₂Cl₂. The combined organic extractswere washed with H₂O, brine, dried over Na₂SO₄, filtered andconcentrated under reduced pressure. The resulting residue was purifiedby silica gel chromatography (typical eluents included either a mixtureof or hexanes and EtOAc or a mixture of CH₂Cl₂ and a 90:9:1 mixture ofCH₂Cl₂/CH₃OH/concentrated NH₄OH) to afford the desired amines VI. Theproduct structure was verified by ¹H NMR and by mass analysis.

General Procedure for Preparing(4-Phenylpiperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneCarboxamides VIII

Conditions: E) acid chloride, Et₃N, CH₂Cl₂.

General Procedure (GP-E) for Carboxamide Formation

A mixture of amine VII (1 equiv), desired acid chloride (1 equiv) andtriethylamine (Et₃N) (3 equiv) in CH₂Cl₂ (0.25 M) was stirred from 0° C.to room temperature until the reaction was complete by LC-MS. Themixture was diluted with H₂O and extracted with CH₂Cl₂. The combinedorganic extracts were washed with H₂O, brine, dried over Na₂SO₄,filtered and concentrated under reduced pressure. The resulting residuewas purified by silica gel chromatography (typical eluents includedeither a mixture of or hexanes and EtOAc or a mixture of CH₂Cl₂ and a90:9:1 mixture of CH₂Cl₂/CH₃₀H/concentrated NH₄OH) to afford the desiredcarboxamides VIII. The product structure was verified by ¹H NMR and bymass analysis.

General Procedures for Preparing(4-Phenylpiperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneSulfonamides IX

Conditions: F) sulfonyl chloride, i-Pr₂NEt, CH₂Cl₂.

General Procedure (GP-F) for Sulfonamide Formation

A mixture of amine VII (1 equiv), desired sulfonyl chloride (1 equiv)and i-Pr₂NEt (3 equiv) in CH₂Cl₂ (0.25 M) was stirred from 0° C. to roomtemperature until the reaction was complete by LC-MS. The mixture wasdiluted with H₂O and extracted with CH₂Cl₂. The combined organicextracts were washed with H₂O, brine, dried over Na₂SO₄, filtered andconcentrated under reduced pressure. The resulting residue was purifiedby silica gel chromatography (typical eluents included either a mixtureof or hexanes and EtOAc or a mixture of CH₂Cl₂ and a 90:9:1 mixture ofCH₂Cl₂/CH₃OH/concentrated NH₄OH) to afford the desired sulfonamides IX.The product structure was verified by ¹H NMR and by mass analysis.

General Procedures for Preparing Alkylated(4-Phenylpiperidin-1-yl)(4,5,6,7-tetrahydro-H-pyrazolo[3,4-c]pyridin-3-yl)methanonesX

Conditions: G) aldehyde or ketone, NaBH(OAc)₃, CH₂Cl₂.

General Procedure (GP-G) for Sulfonamide Formation

A mixture of amine VII (1 equiv), desired aldehyde or ketone (1.5 equiv)and HOAc (6 equiv) in CH₂Cl₂ (0.25 M) was stirred for 16 hours at roomtemperature. To this was added sodium triacetoxyborohydride (NaBH(OAc)₃)and the mixture stirred at room temperature until the reaction wascomplete by LC-MS. The mixture was diluted with aqueous, saturatedNaHCO₃ solution and extracted with CH₂Cl₂. The combined organic extractswere washed with H₂O, brine, dried over Na₂SO₄, filtered andconcentrated under reduced pressure. The resulting residue was purifiedby silica gel chromatography (typical eluents included either a mixtureof or hexanes and EtOAc or a mixture of CH₂Cl₂ and a 90:9:1 mixture ofCH₂Cl₂/CH₃OH/concentrated NH₄OH) to afford the desired amines X. Theproduct structure was verified by ¹H NMR and by mass analysis.

General Procedures for Preparing(4-Phenylpiperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanoneCarboxamides XII

Conditions: H) acid chloride, Et₃N, CH₂Cl₂.

General Procedure (GP-H) for Carboxamide Formation

A mixture of amine XI (1 equiv), desired acid chloride (1 equiv) andtriethylamine (Et₃N) (3 equiv) in CH₂Cl₂ (0.25 M) was stirred from 0° C.to room temperature until the reaction was complete by LC-MS. Themixture was diluted with H₂O and extracted with CH₂Cl₂. The combinedorganic extracts were washed with H₂O, brine, dried over Na₂SO₄,filtered and concentrated under reduced pressure. The resulting residuewas purified by silica gel chromatography (typical eluents includedeither a mixture of or hexanes and EtOAc or a mixture of CH₂Cl₂ and a90:9:1 mixture of CH₂Cl₂/CH₃OH/concentrated NH₄OH) to afford the desiredcarboxamides XII. The product structure was verified by ¹H NMR and bymass analysis.

General Procedures for Preparing(4-Phenylpiperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanoneSulfonamides XIII

Conditions: I) sulfonyl chloride, i-Pr₂NEt, CH₂Cl₂.

General Procedure (GP-I) for sulfonamide formation: A mixture of amineXI (1 equiv), desired sulfonyl chloride (1 equiv) and i-Pr₂NEt (3 equiv)in CH₂Cl₂ (0.25 M) was stirred from 0° C. to room temperature until thereaction was complete by LC-MS. The mixture was diluted with H₂O andextracted with CH₂Cl₂. The combined organic extracts were washed withH₂O, brine, dried over Na₂SO₄, filtered and concentrated under reducedpressure. The resulting residue was purified by silica gelchromatography (typical eluents included either a mixture of or hexanesand EtOAc or a mixture of CH₂Cl₂ and a 90:9:1 mixture ofCH₂Cl₂/CH₃OH/concentrated NH₄OH) to afford the desired sulfonamidesXIII. The product structure was verified by ¹H NMR and by mass analysis.

General Procedures for Preparing Alkylated(4-Phenylpiperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanoneXIV

Conditions: J) aldehyde or ketone, NaBH(OAc)₃, CH₂Cl₂.

General Procedure (GP-J) for Sulfonamide Formation

A mixture of amine XI (1 equiv), desired aldehyde or ketone (1.5 equiv)and HOAc (6 equiv) in CH₂Cl₂ (0.25 M) was stirred for 16 hours at roomtemperature. To this was added sodium triacetoxyborohydride (NaBH(OAc)₃)and the mixture stirred at room temperature until the reaction wascomplete by LC-MS. The mixture was diluted with aqueous, saturatedNaHCO₃ solution and extracted with CH₂Cl₂. The combined organic extractswere washed with H₂O, brine, dried over Na₂SO₄, filtered andconcentrated under reduced pressure. The resulting residue was purifiedby silica gel chromatography (typical eluents included either a mixtureof or hexanes and EtOAc or a mixture of CH₂C₁ and a 90:9:1 mixture ofCHCl₂/CH₃OH/concentrated NH₄OH) to afford the desired amines XIV. Theproduct structure was verified by ¹H NMR and by mass analysis.

Preparation 4-(3-Fluoro-2-(trifluoromethyl)phenyl)piperidineHydrochloride (5)

Step A: A solution of tert-butyl 4-oxopiperidine-1-carboxylate (1, 1.0g, 5.02 mmol) in THF (30 mL) was cooled to −78° C. LiHMDS (1.0 Msolution in THF, 6.52 mL) was added dropwise over 30 min. The reactionwas stirred at −78° C. for 1 h, then a solution ofN-phenyl-bis(trifluoromethanesulfonimide) (2.52 g, 7.05 mmol) in THF(5.0 mL) was added dropwise over 30 min. The mixture stirred at 0° C.for 3 h, and was then concentrated under reduced pressure. The residuewas chromatographed over silica gel (Isco CombiFlash Rf unit, 24 gRedisep column, 0% to 100% EtOAc in hexanes) to provide tert-butyl4-(((trifluoromethyl)sulfonyl)oxy)-5,6-dihydropyridine-1(2H)-carboxylate(2) as a light yellow oil (1.50 g, 90%): ¹H NMR (300 MHz, CDCl₃) δ5.75(br s, 1H), 4.05-4.02 (m, 2H), 3.64-3.60 (m, 2H), 2.44-2.42 (m, 2H),1.46 (s, 9H).

Step B: A mixture of tert-butyl4-(((trifluoromethyl)sulfonyl)oxy)-5,6-dihydropyridine-1(2H)-carboxylate(2, 3.50 g, 10.6 mmol), 3-fluoro-(2-trifluoromethyl)phenyl boronic acid(2.19 g, 10.6 mmol), Pd(PPh₃)₄ (1.22 g, 1.06 mmol), and 2 M Na²CO³ (62mL) in DME (120 mL) was heated to 80° C. for 6 h. The mixture cooled toambient temperature and was diluted with 5% aqueous LiCl solution (100mL). The mixture was extracted with EtOAc (3×50 mL), and the combinedorganic extracts were washed with brine (2×50 mL) and concentrated underreduced pressure. The residue was diluted in CH₂Cl₂ (100 mL) and sentthrough a 300 mL silica gel plug, eluting with 10% EtOAc in hexanes (800mL). The resulting filtrate was concentrated under reduced pressure andwas chromatographed over silica gel (Isco CombiFlash R^(f) unit, 80 gRedisep column, 0% to 50% EtOAc in hexanes) to provide tert-butyl4-(3-fluoro-2-(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylate(3) as a light yellow oil (2.39 g, 69%): ¹H NMR (300 MHz, DMSO-d₆) δ7.75-7.61 (m, 1H), 7.49-7.36 (m, 1H), 7.17 (d, J=7.8 Hz, 1H), 5.63-5.54(m, 1H), 3.97-3.86 (m, 2H), 3.57-3.45 (m, 2H), 2.31-2.18 (m, 2H), 1.42(s, 9H).

Step C: A mixture of tert-butyl4-(3-fluoro-2-(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylate(3, 4.7 g, 13.6 mmol) and 10% Pd/C (1.0 g) in EtOH (100 mL) was placedunder an atmosphere of H₂ (30 psi) at ambient temperature for 18 h. themixture was filtered through a Celite, and the filtrate was concentratedunder reduced pressure to give tert-butyl4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carboxylate (4) as aclear oil (4.80 g, >99%): ¹H NMR (300 MHz, DMSO-d₆) δ 7.72-7.60 (m, 1H),7.46 (d, J=8.1 Hz, 1H), 7.30 (dd, J=12.3, 8.1 Hz, 1H), 4.18-4.00 (m,2H), 3.11-2.95 (m, 1H), 2.92-2.64 (m, 2H), 1.76-1.51 (m, 4H), 1.42 (s,9H).

Step D: To a solution of tert-butyl4-(3-fluoro-2(trifluoromethyl)phenyl)piperidine-1-carboxylate (4, 4.70g, 13.6 mmol) in CH₂Cl₂ (40 mL) was added 2 N HCl (2.0 M in Et₂O, 40mL). The mixture stirred at ambient temperature for 18 h and was dilutedwith Et₂O (100 mL). The resulting precipitate was collected byfiltration to give 4-(3-fluoro-2-(trifluoromethyl)phenylpiperidinehydrochloride as a white powder (5, 3.69 g, 96%): ¹H NMR (300 MHz,DMSO-d₆) δ 9.09-8.80 (m, 2H), 7.83-7.70 (m, 1H), 7.44-7.29 (m, 2H),3.42-3.31 (m, 2H), 3.29-3.15 (m, 1H), 3.14-2.95 (m, 2H), 2.11-1.91 (m,2H), 1.89, 1.76 (m, 2H); ESI MS m/z 248 [M+H]+.

Preparation 4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidine (8)

Step A: A mixture of tert-butyl4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-5,6-dihydropyridine-1(2H)-carboxylate(6, 57.4 g, 185 mmol), 3 1-bromo-3,4-difluoro-2-(trifluoromethyl)benzene(48.5 g, 185 mmol), Pd(PPh₃)₄ (21.5 g, 18.5 mmol), and 2 M Na₂CO₃ (150mL) in DME (500 mL) was heated to 80° C. for 16 h. The mixture cooled toambient temperature and was diluted with 5% aqueous LiCl solution (100mL). The mixture was extracted with EtOAc (3×200 mL), and the combinedorganic extracts were washed with brine (2×200 mL) and concentratedunder reduced pressure. The residue was diluted in CH₂Cl₂ (100 mL) andsent through a 300 mL silica gel plug, eluting with 10% EtOAc in hexanes(800 mL). The resulting filtrate was concentrated under reduced pressureand was chromatographed over silica gel (Isco CombiFlash Rf unit, 3×330g Redisep columns, 0% to 50% EtOAc in hexanes) to provide tert-butyl4-(3,4-difluoro-2-(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylate(7) as a white solid (59.0 g, 92%): ¹H NMR (300 MHz, CDCl₃) 57.34-7.28(m, 1H), 6.93 (m, 1H), 5.55 (br, 1H), 4.01 (br, 2H), 3.60 (m, 2H), 2.30(m, 2H), 1.50 (s, 9H); MS (ESI+) m/z 308 [M+H−C₄H₈]+.

Step B: A mixture of tert-butyl4-(3,4-difluoro-2-(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylate(7, 59.0 g, 162.3 mmol) and 10% Pd/C (5.0 g) in EtOH (200 mL) was placedunder an atmosphere of H₂ (30 psi) at ambient temperature for 72 h. themixture was filtered through a Celite, and the filtrate was concentratedunder reduced pressure to give tert-butyl4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carboxylate (8)as a white solid (57.9 g, 97%): ¹H NMR (300 MHz, CDCl₃) 87.36-7.28 (m,1H), 7.12 (m, 1H), 4.24 (br, 2H), 3.06 (m, 1H), 2.80 (m, 2H), 1.78-1.52(m, 4H), 1.48 (s, 9H); MS (ESI+) m/z 310 [M+H−C₄H₈]+.

Preparation 4-(5-Fluoro-2-(trifluoromethyl)phenyl)piperidineHydrochloride (11)

Step A: A mixture of tert-butyl4-(((trifluoromethyl)sulfonyl)oxy)-5,6-dihydropyridine-1(2H)-carboxylate(2, 1.10 g, 3.32 mmol), 5-fluoro-(2-trifluoromethyl)phenyl boronic acid(0.69 g, 3.32 mmol), Pd(PPh₃)₄ (0.384 g, 0.332 mmol), and 2 M Na₂CO₃ (20mL) in DME (50 mL) was heated at 80° C. for 6 h. The mixture cooled toambient temperature, and the resulting solids were removed by filtrationthrough a Celite pad. The filtrate was washed brine solution (4×50 mL)and concentrated under reduced pressure. The resulting residue waschromatographed over silica gel (Isco CombiFlash Rf unit, 40 g Redisepcolumn, 0% to 80% EtOAc in hexanes) to provide tert-butyl4-(5-fluoro-2-(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylate(9) as a clear oil (0.542 g, 48%): ¹H NMR (300 MHz, DMSO-d₆) δ 7.80 (dd,J=8.4, 6.0 Hz, 1H), 7.42-7.27 (m, 2H), 5.62 (br s, 1H), 3.97-3.87 (m,2H), 3.51 (t, J=5.7 Hz, 2H), 2.34-2.23 (m, 2H), 1.42 (s, 9H).

Step B: A mixture of tert-butyl4-(5-fluoro-2-(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylate(9, 0.542 g, 1.58 mmol) and HCl (2 N solution in Et₂O, 10 mL) in CH₂Cl₂(20 mL) stirred at ambient temperature for 18 h. The reaction mixturewas diluted with Et₂O (30 mL), and the resulting precipitate wascollected by filtration to provide4-(5-fluoro-2-(trifluoromethyl)phenyl)-1,2,3,6-tetrahydropyridinehydrochloride (10) as a white solid (0.393 g, 88%): ¹H NMR (300 MHz,DMSO-d₆) δ 9.26-9.00 (m, 2H), 7.84 (dd, J=8.7, 5.4 Hz, 1H), 7.46-7.36(m, 1H), 7.24 (dd, J=9.3, 2.4 Hz, 1H), 5.67 (br s, 1H), 3.76-3.64 (m,2H), 3.27 (t, J=5.1 Hz, 2H), 2.70-2.40 (m, 2H).

Step C: A mixture of4-(5-fluoro-2-(trifluoromethyl)phenyl)-1,2,3,6-tetrahydropyridinehydrochloride (10, 0.393 g, 1.41 mmol) and PtO₂ (0.095 mg, 0.42 mmol) inEtOAc (14 mL) was stirred at ambient temperature for 18 h under aballoon of H₂. The mixture was filtered over Celite, and the filtratewas concentrated under reduced pressure and dissolved in CH₂Cl₂ (4 mL).To this solution was added HCl (2 N in Et₂O, 4.0 mL) and the resultingmixture stirred at ambient temperature for 20 min. The resultingsuspension was diluted with Et₂O (20 mL) and the solids were collectedby filtration to provide4-(5-fluoro-2-(trifluoromethyl)phenyl)piperidine hydrochloride (11) as awhite solid (309 mg, 78%): ¹H NMR (300 MHz, DMSO-d₆) δ 8.81 (br s, 2H),7.80 (dd, J=9.3, 6.0 Hz, 1H), 7.39-7.26 (m, 2H), 3.43-3.30 (m, 1H,overlaps with H₂O), 3.24-2.97 (m, 3H), 2.11-1.90 (m, 2H), 1.88-1.75 (m,2H); ESI MS m/z 248 [M+H]+.

Preparation 4-(2-Chloro-3-fluorophenyl)piperidine Hydrochloride (14)

Step A: A mixture of tert-butyl4-(((trifluoromethyl)sulfonyl)oxy)-5,6-dihydropyridine-1(2H)-carboxylate(2, 1.18 g, 3.56 mmol), 2-chloro-3-fluorophenyl boronic acid (0.621 g,3.56 mmol), Pd(PPh₃)₄ (0.411 g, 0.356 mmol) and 2 M Na₂CO₃ (20 mL) inDME (50 mL) was heated at 80° C. for 6 h. The mixture cooled to ambienttemperature, and the resulting solids were removed by filtration througha Celite pad. The filtrate was washed brine solution (4×50 mL) andconcentrated under reduced pressure. The resulting residue waschromatographed over silica gel (Isco CombiFlash Rf unit, 40 g Redisepcolumn, 0% to 80% EtOAc in hexanes) to provide tert-butyl4-(2-chloro-3-fluorophenyl)-5,6-dihydropyridine-1(2H)-carboxylate (12)as a clear oil (0.579 g, 52%): ¹H NMR (300 MHz, DMSO-d₆) δ 7.43-7.31 (m,2H), 7.16-7.10 (m, 1H), 5.81-5.72 (m, 1H), 4.03-3.93 (m, 2H), 3.53 (t,J=5.7 Hz, 2H), 2.41-2.31 (m, 2H), 1.43 (s, 9H).

Step B: A mixture of tert-butyl4-(2-chloro-3-fluorophenyl)-5,6-dihydropyridine-1(2H)-carboxylate (12,0.488 g, 1.41 mmol) and PtO₂ (0.109 g, 0.48 mmol) in EtOAc (15 mL) wasstirred at ambient temperature for 18 h under a balloon of H₂. Themixture was filtered over Celite, and the filtrate was concentratedunder reduced pressure and dissolved in CH₂Cl₂ (4 mL). To this solutionwas added HCl (2 N in Et₂O, 4.0 mL) and the resulting mixture stirred atambient temperature for 20 min. The resulting suspension was dilutedwith Et₂O (20 mL) and the solids were collected by filtration to providetert-butyl-4-(2-chloro-3-fluorophenyl)piperidine-1 carboxylate (13) as aclear semi-solid (0.471 g, 95%): ¹H NMR (300 MHz, DMSO-d₆) δ 7.43-7.19(m, 3H), 4.17-4.01 (m, 2H), 3.20-3.03 (m, 1H), 2.95-2.68 (m, 2H),1.79-1.65 (m, 2H), 1.58-1.45 (m, 2H), 1.41 (s, 9H).

Step C: To a solution of tert-butyl 4-(2-chloro-3-fluorophenyl)piperidine-1-carboxylate (13, 0.520 g, 1.66 mmol) in CH₂Cl₂ (10 mL)under an atmosphere of N₂ was added HCl (2 N in Et₂O, 10 mL) solutionwas stirred at ambient temperature for 18 h. The reaction mixture wasdiluted with Et₂O (20 mL). The resulting precipitate was collected byfiltration and washed with Et₂O to provide4-(2-chloro-3-fluorophenyl)piperidine hydrochloride (14) as a whitesolid (309 mg, 74%): ¹H NMR (300 MHz, DMSO-d₆) δ 8.81-8.55 (m, 2H),7.47-7.37 (m, 1H), 7.36-7.27 (m, 1H), 7.21-7.13 (m, 1H), 3.43-3.20, (m,3H), 3.17-2.97 (m, 2H), 2.00-1.73 (m, 4H).

Preparation 4-(2-Chloro-5-fluorophenyl)piperidine Hydrochloride (17)

Step A: A mixture of tert-butyl4-(((trifluoromethyl)sulfonyl)oxy)-5,6-dihydropyridine-1(2H)-carboxylate(2, 1.10 g, 3.3 mmol), 2-chloro-5-fluorophenyl boronic acid (0.58 g, 3.3mmol), Pd(PPh₃)₄ (0.38 g, 0.33 mmol), and 2 M Na₂CO₃ (20 mL) in DME (50mL) was heated at 80° C. for 6 h. The mixture cooled to ambienttemperature, and the resulting solids were removed by filtration througha Celite pad. The filtrate was washed brine solution (4×50 mL) andconcentrated under reduced pressure. The resulting residue waschromatographed over silica gel (Isco CombiFlash Rf unit, 40 g Redisepcolumn, 0% to 80% EtOAc in hexanes) to provide tert-butyl 4-(2-chloro-5fluorophenyl)-5,6-dihydropyridine-1(2H)-carboxylate (15) as a clear oil(0.57 g, 55%): ¹H NMR (300 MHz, DMSO-d₆) δ 7.53-7.46 (m, 1H), 7.23-7.14(m, 2H), 5.79-5.74 (m, 1H), 4.00-3.92 (m, 2H), 3.52 (t, J=5.7 Hz, 2H),2.40-2.32 (m, 2H), 1.43 (s, 9H).

Step B: To a solution of tert-butyl4-(2-chloro-5-fluorophenyl)-5,6-dihydropyridine-1(2H)-carboxylate (15,0.573 g, 1.84 mmol) in CH₂Cl₂ (11 mL) was added HCl (2.0 N solution inEt₂O, 11.0 mL) and the mixture stirred at ambient temperature for 18 h.The reaction mixture was diluted with Et₂O (30 mL), and the resultingprecipitate was collected by filtration to provide4-(2-chloro-5-fluorophenyl)-1,2,3,6-tetrahydropyridine hydrochloride(16) as a white solid (0.267 g, 80%): ¹H NMR (300 MHz, DMSO-d₆) δ 9.15(br s, 2H), 7.54 (dd, J=9.0, 5.4 Hz, 1H), 7.29-7.17 (m, 1H), 7.14 (dd,J=9.3, 3.0 Hz, 1H), 5.84-5.79 (m, 1H), 3.76-3.68 (m, 2H), 3.28 (t, J=5.7Hz, 2H), 2.62-2.53 (m, 2H); ESI MS m/z 212 [M+H]+.

Step C: A mixture of4-(5-fluoro-2-(trifluoromethyl)phenyl)-1,2,3,6-tetrahydropyridinehydrochloride (16, 0.310 g, 1.31 mmol) PtO₂ (0.085 g, 0.37 mmol), andHOAc (71 μL, 1.31 mmol) in EtOAc (12 mL) stirred at ambient temperaturefor 18 under an atmosphere of H₂ (1 atm). The reaction mixture wasdiluted with EtOAc (50 mL) and CH₃OH (5 mL) and filtered over Celite andthe filtrate was concentrated under reduced pressure and dissolved inCH₂Cl₂ (5 mL). To this solution was added HCl (2.0 N solution in Et₂O,2.0 mL) and the mixture stirred at ambient temperature for 5 min. Theresulting suspension was diluted with Et₂O (20 mL) and the solidscollected by filtration to give 4-(2-chloro-5 fluorophenyl)piperidinehydrochloride (17) as an off-white solid (215 mg, 48%): ¹H NMR (300 MHz,DMSO-d₆) δ 8.93-8.20 (m, 2H), 7.58-7.48 (m, 1H), 7.22-7.12 (m, 1H),7.11-7.01 (m, 1H), 3.43-3.30 (m, 2H), 3.29-3.16 (m, 1H), 3.14-2.89 (m,2H), 2.01-1.68 (m, 4H); ESI MS m/z 214 [M+H]+.

Preparation 4-(3,5-Bis(trifluoromethyl)phenyl)piperidine Hydrochloride(20)

Step A: A solution of tert-butyl4-(((trifluoromethyl)sulfonyl)oxy)-5,6-dihydropyridine-1(2H)-carboxylate(2, 1.10 g, 3.32 mmol) and (3,5-bis(trifluoromethyl)phenyl)boronic acid(1.42 g, 3.32 mmol), Pd(PPh₃)₄ (0.38 g, 0.33 mmol) and 2 M Na₂CO₃ (20mL) in DME (50 mL) was heated at 80° C. for 6 h. The mixture cooled toambient temperature, and the resulting solids were removed by filtrationthrough a Celite pad. The filtrate was washed brine solution (4×50 mL)and concentrated under reduced pressure. The resulting residue waschromatographed over silica gel (Isco CombiFlash Rf unit, 40 g Redisepcolumn, 0% to 80% EtOAc in hexanes) to provide tert-butyl4-(3,5-bis(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylate(18) as a yellow oil (0.891 g, 68%): ¹H NMR (300 MHz, DMSO-d₆) δ8.09-8.04 (m, 2H), 8.00-7.96 (m, 1H), 6.53-6.42 (m, 1H), 4.09-4.00 (m,2H), 3.55 (t, J=5.7 Hz, 2H), 2.60-2.52 (m, 2H), 1.43 (s, 9H).

Step B: To a solution of tert-butyl 4-(3,5bis(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylate (18,0.891 g, 2.25 mmol) in CH₂Cl₂ (13.5 mL) in CH₂Cl₂ (11 mL) was added HCl(2.0 N solution in Et₂O, 11.0 mL) and the mixture stirred at ambienttemperature for 18 h. The reaction mixture was diluted with Et₂O (30mL), and the resulting precipitate was collected by filtration toprovide 4-(3,5-bis(trifluoromethyl)phenyl)-1,2,3,6-tetrahydropyridinehydrochloride (19) as a white solid (0.452 g, 60%): ¹H NMR (300 MHz,DMSO-d₆) δ 9.34 (br s, 2H), 8.14-8.09 (m, 2H), 8.08-8.04 (m, 1H),6.59-6.53 (m, 1H), 3.83-3.74 (m, 2H), 3.38-3.25 (m, 2H), 2.83-2.71 (m,2H); ESI MS m/z 296 [M+H]+.

Step C: A mixture of4-(3,5-bis(trifluoromethyl)phenyl)-1,2,3,6-tetrahydropyridinehydrochloride (19, 452 mg, 1.37 mmol), ammonium formate (0.863 g, 13.7mmol), and 10% Pd/C (0.332 g) in CH₃OH (10 mL) was heated at reflux for7 h. The mixture was cooled to ambient temperature and was filtered overCelite. The filtrate was concentrated and the resulting residue wasdiluted in CH₂Cl₂ (8 mL) and CH₃OH (2 mL). To this solution was addedHCl (2.0 N solution in Et₂O, 6 mL). The resulting solids were collectedby filtration to give 4-(3,5-bis(trifluoromethyl)phenyl)piperidinehydrochloride (20) as a white solid (376 mg, 82%): ¹H NMR (300 MHz,DMSO-d₆) δ 9.05-8.58 (m, 2H), 8.03-7.97 (m, 1H), 7.95-7.87 (m, 2H),3.44-3.29 (m, 2H, overlaps with H₂O), 3.19-2.88 (m, 3H), 2.09-1.80 (m,4H); ESI MS m/z 298 [M+H]+.

Preparation 4-(2-Fluoro-6-(trifluoromethyl)phenyl)piperidineHydrochloride (23)

Step A: A mixture of tert-butyl4-(((trifluoromethyl)sulfonyl)oxy)-5,6-dihydropyridine-1(2H)-carboxylate(2, 1.20 g, 3.62 mmol), and 6-fluoro-(2-trifluoromethyl)phenyl boronicacid (0.528 g, 2.53 mmol), Pd(PPh₃)₄ (0.292 g, 0.253 mmol), and 2 MNa₂CO₃ (20 mL) in DME (30 mL) was heated to 80° C. for 4 h. The mixturecooled to ambient temperature, was diluted with EtOAc (50 mL), andfiltered through a Celite pad. The organic filtrate was washed withsaturated sodium bicarbonate solution (2×30 mL), H₂O (30 ml), andconcentrated to under reduced pressure. The resulting residue waschromatographed over silica gel (Isco CombiFlash Companion unit, 40 gRedisep column, 0% to 10% EtOAc in hexanes) to provide tert-butyl4-(2-fluoro-6-(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylate(21) as a clear oil (0.479 g, 39%): ¹H NMR (300 MHz, DMSO-d₆) δ7.66-7.51 (m, 3H), 5.68 (s, 1H), 4.04-3.82 (m, 2H), 3.67-3.39 (m, 2H),2.39-2.02 (m, 2H), 1.43 (s, 9H).

Step B: A mixture of tert-butyl4-(2-fluoro-6-(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylate(21, 0.479 g, 1.41 mmol) and PtO₂ (0.095 g, 0.42 mmol) in EtOAc (15 mL)and HOAc (82 μL, 1.4 mmol) stirred at ambient temperature for 72 h underan atmosphere of H₂ (1 atm). The mixture was diluted with EtOAc (50 mL)and filtered over Celite. The filtrate was concentrated and the residuewas chromatographed over silica gel (Isco CombiFlash Companion unit, 24g Redisep column, 0% to 15% EtOAc in hexanes) to provide tert-butyl4-(2-fluoro-6-(trifluoromethyl)phenyl)piperidine-1-carboxylate (22) as awhite solid (0.219 g, 45%): ¹H NMR (300 MHz, DMSO-d₆) δ 7.62-7.48 (m,3H), 4.15-3.94 (m, 1H), 3.10-2.94 (m, 2H), 2.93-2.67 (m, 2H), 2.00-1.79(m, 2H), 1.67-1.55 (m, 2H), 1.42 (s, 9H).

Step C: To a solution of tert-butyl4-(2-fluoro-6-(trifluoromethyl)phenyl)piperidine-1-carboxylate (22,0.219 g, 0.63 mmol) in CH₂Cl₂ (4 mL) was added 2 N HCl (2.0 N solutionin Et₂O, 4 mL), and the mixture was stirred at ambient temperature for 4h. The reaction mixture was diluted with Et₂O (50 mL) and the solidswere collected by filtration to give4-(2-fluoro-6-(trifluoromethyl)phenyl)piperidine hydrochloride (23) asan offwhite solid (158 mg, 88%): H NMR (300 MHz, DMSO-d₆) δ 8.82 (br s,1H), 8.50 (br s, 1H), 7.66-7.48 (m, 3H), 3.42-3.33 (m, 2H), 3.24-2.95(m, 3H), 2.35-2.15 (m, 2H), 1.87-1.74 (m, 2H); ESI MS m/z 248 [M+H]+.

Preparation 4-(3,5-Difluoro-2-(trifluoromethyl)phenyl)piperidineHydrochloride (28)

Step A: A suspension of 3,5-difluoro-2-(trifluoromethyl)aniline (24, 1.0g, 5.07 mmol) in a 48% aqueous HBr (8 mL) and H₂O (8 mL) was stirred at−5° C. for 5 min. To the suspension, NaNO₂ (350 mg, 5.07 mmol) was addedin a 10 mL aqueous solution dropwise maintaining −5° C. The resultingmixture was stirred at −5° C. for 1 h then CuBr (1.09 g, 7.63 mmol) wasadded portion-wise and the resulting suspension was allowed to slowlywarm to ambient temperature. After 4 hours, the resulting solution wasextracted with hexanes (3×75 mL). The combined organics were dried overNa₂SO₄, filtered, and concentrated under reduced pressure. The resultingresidue was chromatographed over silica gel (40 g Redisep column, purehexanes) to afford 1-bromo-3,5-difluoro-2-(trifluoromethyl)benzene (25)as a light yellow liquid (1.01 g, 68%). ¹H NMR (300 MHz, CDCl₃) δ7.34-7.28 (m, 1H), 6.99-6.85 (m, 1H).

Step B: A mixture of l-bromo-3,5-difluoro-2-(trifluoromethyl)benzene(25, 0.200 g, 0.76 mmol) and tert-butyl4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-5,6-dihydropyridine-1(2H)-carboxylate(0.237 g, 0.76 mmol), Pd(dppf) (0.056 g, 0.077 mmol), and 2 N Na₂CO₃ (2mL, 4 mmol) in DME (3 mL) was heated to 85° C. for 5 h. The mixture wasdiluted with H₂O (50 mL) and extracted with CH₂Cl₂ (3×75 mL). Thecombined organics were dried over Na₂SO₄, concentrated under reducedpressure, and the resulting residue was chromatographed over silica gel(24 g Redisep column, 0-25% EtOAc in hexanes) to afford tert-butyl4-(3,5-difluoro-2-(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylate(26) as a light yellow oil (0.325 g, 90%). ¹H NMR (300 MHz, CDCl₃) δ6.92-6.80 (m, 1H), 6.78-6.68 (m, 1H), 5.58 (s, 1H), 4.06-3.94 (m, 2H),3.69-3.53 (m, 2H), 2.36-1.24 (m, 2H), 1.50 (s, 9H).

Step C: A mixture of tert-butyl4-(3,5-difluoro-2-(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylate(26, 0.750 g, 2.11 mmol) and 10% Pd/C (1.0 g) in EtOH (50 mL) stirred atambient temperature under an atmosphere of H₂ for 24 h. The mixture wasfiltered through Celite and the filtrate concentrated under reducedpressure to afford tert-butyl4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carboxylate (27)as a white solid (535 mg, 82%). ¹H NMR (300 MHz, CDCl₃) δ 6.97-6.85 (m,1H), 6.85-6.69 (m, 1H), 4.37-4.16 (m, 2H), 3.23-3.05 (m, 2H), 2.89-2.71(m, 2H), 1.86-1.51 (m, 4H), 1.48 (s, 9H).

Step D: A solution of tert-butyl4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carboxylate (27,0.590 g, 1.61 mmol) in CH₂Cl₂ (10 mL) and HCl (2.0 N solution in Et₂O,10 mL) stirred at ambient temperature for 18 h. The resulting solidswere filtered to afford4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidine hydrochloride (28)as a white solid (0.309 g, 63%). ¹H NMR (300 MHz, CDCl₃) δ 7.01-6.94 (m,1H), 6.94-6.76 (m, 1H), 3.82-3.60 (m, 2H), 3.42-3.02 (m, 3H), 2.22-1.99(m, 4H).

Preparation(4-(3-Fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneHydrochloride (30)

Step A: To a solution of 4-(3-fluoro-2-trifluoromethyl)phenylpiperidinehydrochloride (5, 0.080 g, 0.28 mmol),6-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylicacid (0.098 g, 0.67 mmol), and diisopropylethylamine (0.15 mL, 0.85mmol) in DMF (5.3 mL) was added EDCI (0.065 mg, 0.34 mmol) and HOBt (46mg, 0.34 mmol), and the mixture stirred at ambient temperature for 24 h.The mixture was diluted with H₂O (30 mL) and extracted with EtOAc (4×30mL). The combined organic extracts were washed with a saturated brinesolution (4×30 mL) and concentrated to dryness under reduced pressure.The obtained residue was chromatographed over silica gel (IscoCombiFlash Rf unit, 12 g Redisep column, 0% to 10% CH₃OH in CH₂Cl₂ with0.1% NH₄OH in CH₂Cl₂) to provide tert-butyl3-(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate(29) as a white solid (66 mg, 47%): ¹H NMR (300 MHz, DMSO-d₆) δ13.20-12.78 (m, 1H), 7.73-7.59 (m, 1H), 7.46 (d, J=7.2 Hz, 1H),7.37-7.24 (m, 1H), 4.90-4.60 (m, 2H), 4.53-4.43 (m, 2H), 3.60-3.48 (m,2H), 3.28-2.98 (m, 2H), 2.85-2.69 (m, 1H), 2.65-2.50 (m, 2H, overlapswith solvent), 1.87-1.56 (m, 4H), 1.42 (s, 9H); ESI MS m/z 497 [M+H]+.

Step B: To a solution of tert-butyl3-(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate(29, 0.066 g, 0.13 mmol) in CH₂Cl₂ (2 mL) was added HCl (2 mL, 2.0 Nsolution in Et₂O). The mixture stirred at ambient temperature for 18 h,was diluted with Et₂O (30 mL), and the resulting solids were collectedby filtration to give(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (30) as a white solid (0.027 g, 47%): ¹H NMR (300 MHz,DMSO-d₆) δ 9.46-9.20 (m, 2H), 7.74-7.61 (m, 1H), 7.46 (d, J=8.1 Hz, 1H),7.37-7.25 (m, 1H), 4.70-4.44 (m, 2H), 4.34-4.22 (m, 2H), 3.50-3.10 (m,4H), 2.93-2.76 (m, 3H), 1.86-1.60 (m, 4H); ESI MS m/z 468 [M+H]+.

Preparation((4-(3-Fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneHydrochloride (32)

Step A: To a solution of 4-(3-fluoro-2-trifluoromethyl)phenylpiperidinehydrochloride (5, 0.080 g, 0.28 mmol),5-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylicacid (0.098 g, 0.67 mmol), and diisopropylethylamine (0.15 mL, 0.85mmol) in DMF (5.3 mL) was added EDCI (0.065 mg, 0.34 mmol) and HOBt (46mg, 0.34 mmol), and the mixture stirred at ambient temperature for 24 h.The mixture was diluted with H₂O (30 mL) and extracted with EtOAc (4×30mL). The combined organic extracts were washed with a saturated brinesolution (4×30 mL) and concentrated to dryness under reduced pressure.The obtained residue was chromatographed over silica gel (IscoCombiFlash Rf unit, 12 g Redisep column, 0% to 10% CH₃OH in CH₂Cl₂ with0.1% NH₄OH in CH₂Cl₂) to provide tert-butyl3-(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate(31) as a white solid (0.109 g, 77%): ¹H NMR (300 MHz, DMSO-d₆) δ13.20-12.78 (m, 1H), 7.73-7.59 (m, 1H), 7.46 (d, J=7.2 Hz, 1H),7.37-7.24 (m, 1H), 4.90-4.60 (m, 2H), 4.53-4.43 (m, 2H), 3.60-3.48 (m,2H), 3.28-2.98 (m, 2H), 2.85-2.69 (m, 1H), 2.65-2.50 (m, 2H, overlapswith solvent), 1.87-1.56 (m, 4H), 1.42 (s, 9H); ESI MS m/z 497 [M+H]+.

Step B: To a solution of tert-butyl3-(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate(31, 0.148 g, 0.30 mmol) in CH₂Cl₂ (2 mL) was added HCl (2 mL, 2.0 Nsolution in Et₂O). The mixture stirred at ambient temperature for 18 h,was diluted with Et₂O (30 mL), and the resulting solids were collectedby filtration to give(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (32) as a white solid (0.097 g, 75%): ¹H NMR (300 MHz,DMSO-d₆) δ 9.46-9.20 (m, 2H), 7.74-7.61 (m, 1H), 7.46 (d, J=8.1 Hz, 1H),7.37-7.25 (m, 1H), 4.70-4.44 (m, 2H), 4.34-4.22 (m, 2H), 3.50-3.10 (m,4H), 2.93-2.76 (m, 3H), 1.86-1.60 (m, 4H); ESI MS m/z 468 [M+H]+.

Preparation((4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneTrifluoroacetic Acid Salt (34)

Step A: To a solution of tert-butyl4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carboxylate (9,41.1 g, 113 mmol) in CH₂Cl₂ (50 mL) was added TFA (50 mL). The mixturewas stirred at ambient temperature for 1 h and was concentrated underreduced pressure. The residue was dissolved in DMF (240 mL) and to thissolution was added N,N-diisopropylethylamine (72.4 g, 560 mmol),followed by6-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylicacid (30.1 g, 113 mmol), and HBTU (74.7 g, 169 mmol). The mixturestirred at ambient temperature for 16 h, was diluted with EtOAc (1 L)and washed with H₂O (1.4 L). The organic layer was washed with brine(3×600 mL), dried over Na₂SO₄, filtered, and concentrated under reducedpressure. The resulting residue was chromatographed over silica gel(30-80% EtOAc in hexanes) to give tert-butyl3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-aH-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate(33) as a white solid (41.2 g, 71%): ¹H NMR (300 MHz, CDCl₃) 810.47 (br,1H), 7.37-7.29 (m, 1H), 7.15 (m, 1H), 4.74 (br, 2H), 4.60 (s, 2H), 3.66(br, 2H), 3.23 (m, 1H), 3.02 (br, 2H), 2.72 (m, 2H), 1.91-1.65 (m, 4H),1.89-1.66 (m, 4H), 1.49 (s, 9H); MS (ESI+) m/z 515 [M+H]+.

Step B: To a solution of tert-butyl3-(4-(3,4-difluoro-2-(trifluoro-methyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate(33, 41.2 g, 80.0 mmol) in CH₂Cl₂ (150 mL) was added TFA (70 mL). Themixture stirred at ambient temperature for 16 h and was thenconcentrated under reduced pressure to give((4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneTFA salt (34) as an off-white solid (40.0 g, >99%). The material wasused as is without spectral characterization.

Preparation(4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneTrifluoroacetic Acid Salt (36)

Step A: To a solution of tert-butyl4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carboxylate (9,41.1 g, 113 mmol) in CH₂Cl₂ (50 mL) was added TFA (50 mL). The mixturewas stirred at ambient temperature for 1 h and was concentrated underreduced pressure. The residue was dissolved in DMF (240 mL) and to thissolution was added N,N-diisopropylethylamine (72.4 g, 560 mmol),followed by5-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylicacid (30.1 g, 113 mmol), and HBTU (74.7 g, 169 mmol). The mixturestirred at ambient temperature for 16 h, was diluted with EtOAc (1 L)and washed with H₂O (1.4 L). The organic layer was washed with brine(3×600 mL), dried over Na₂SO₄, filtered, and concentrated under reducedpressure. The resulting residue was chromatographed over silica gel(30-80% EtOAc in hexanes) to give tert-butyl3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate(35) as a white solid (0.068 g, 80%): ¹H NMR (300 MHz, CDCl₃) δ10.23(br, 1H), 7.36-7.28 (m, 1H), 7.15 (m, 1H), 4.86 (br, 2H), 4.62 (s, 2H),3.72 (br, 2H), 3.27-2.74 (m, 5H), 1.90-1.64 (m, 4H), 1.48 (s, 9H); MS(ESI+) m/z 515 [M+H]+.

Step B: To a mixture of tert-butyl3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate(35, 41.2 g, 80.0 mmol) and CH₂Cl₂ (150 mL) was added TFA (70 mL). Themixture was stirred at ambient temperature for 16 h and was concentratedunder reduced pressure. The residue was dissolved in CH₂Cl₂ and thesolution washed with saturated NaHCO₃, dried over Na₂SO₄, filtered, andconcentrated under reduced pressure. The resulting residue waschromatographed over silica gel (0-20% CH₃OH in CH₂Cl₂) to give(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(36) as a white solid (0.052 g, 95%): ¹H NMR (300 MHz, CDCl₃) δ7.36-7.27 (m, 1H), 7.14 (m, 1H), 4.92 (m, 2H), 4.04 (s, 2H), 3.27-2.69(m, 7H), 1.89-1.65 (m, 4H); MS (ESI+) m/z 415 [M+H]+.

Preparation(4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanoneHydrochloride (38)

Step A: To a solution of tert-butyl4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carboxylate (9,0.100 g, 0.27 mmol) in CH₂Cl₂ (10 mL) was added TFA (2 mL). The mixturewas stirred at ambient temperature for 1 h and was concentrated underreduced pressure. The residue was dissolved in DMF (2 mL) and to thissolution was added5-(tert-butoxycarbonyl)-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazole-3-carboxylicacid (0.073 g, 0.28 mmol), HBTU (0.191 g, 0.43 mmol), andN,N-diisopropylethylamine (0.11 g, 0.864 mmol). The mixture stirred atambient temperature for 16 h and was diluted with EtOAc, washed withbrine, dried over Na₂SO₄, filtered, and concentrated under reducedpressure. The resulting residue was chromatographed over silica gel(0-90% EtOAc in hexanes) to give tert-butyl3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,6-dihydropyrrolo[3,4-c]pyrazole-5(1H)-carboxylate(37) as a white solid (0.132 g, 91%): ¹H NMR (300 MHz, CDCl₃) δ 10.39(br, 1H), 7.38-7.30 (m, 1H), 7.15-7.08 (m, 1H), 4.80-4.26 (m, 6H),3.26-3.20 (m, 2H), 2.92 (br, 1H), 1.96-1.66 (m, 4H), 1.51 (s, 9H); MS(ESI+) m/z 501 [M+H]+.

Step B: To a mixture of tert-butyl3-(4-(3,4-difluoro-2-(trifluoro-methyl)phenyl)piperidine-1-carbonyl)-4,6-dihydropyrrolo[3,4-c]pyrazole-5(1H)-carboxylate(37, 0.132 g, 0.26 mmol) and CH₂Cl₂ (1 mL) was added TFA (1 mL). Themixture stirred at ambient temperature for 2 h and was concentratedunder reduced pressure. The residue was dissolved in CH₂Cl₂ and thesolution was washed with saturated NaHCO₃, dried over Na₂SO₄, filtered,and concentrated under reduced pressure. The resulting residue waschromatographed over silica gel (0-20% CH₃OH in CH₂Cl₂) to give(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl) methanone(38) as a white solid (0.070 g, 66%): ¹H NMR (500 MHz, CDCl₃) 87.36-7.31(m, 1H), 7.12 (m, 1H), 4.82 (br, 1H), 4.38 (br, 1H), 4.11 (s, 2H), 4.09(s, 2H), 3.24 (m, 2H), 2.89 (br, 1H), 1.93-1.68 (m, 4H); MS (ESI+) m/z401 [M+H]+.

Preparation(4-(2-Chloro-3-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1Hpyrazolo[3,4-c]pyridin-3-yl)methanoneHydrochloride (40)

Step A: To a mixture of 4-(2-chloro-3-fluorophenyl)piperidinehydrochloride (14, 0.796 g, 3.18 mmol),6-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylicacid (0.935 g, 3.50 mmol), and diisopropylethylamine (1.7 mL, 9.76 mmol)in DMF (30 mL) was added EDCI (0.853 g, 4.45 mmol) and HOBt (0.601 g,4.45 mmol). The mixture stirred at ambient temperature for 120 h, wasconcentrated under reduced pressure, and the obtained residue waschromatographed over silica gel (Isco CombiFlash Rf unit, 40 g Redisepcolumn, 0% to 100% ethyl acetate in hexanes) to provide tert-butyl3-(4-(2-chloro-3-(fluorophenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate(39) as a white solid (0.694 g, 47%): ¹H NMR (300 MHz, CDCl₃) δ7.24-7.18 (m, 1H), 7.06-7.00 (m, 2H), 4.93-4.42 (m, 3H), 3.67-3.65 (m,2H), 3.39-3.01 (m, 3H), 2.73-2.70 (m, 2H), 2.14-1.94 (m, 2H), 1.71-1.68(m, 2H), 1.49-1.44 (m, 11H); ESI MS m/z 463 [M+H]+.

Step B: To a solution of tert-butyl3-(4-(2-chloro-3-(fluorophenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate(39, 0.694 g, 1.50 mmol) in CH₂Cl₂ (7 mL) was added 2 M HCl in Et₂O (16mL). The mixture stirred at ambient temperature for 6 h, was dilutedwith Et₂O (30 mL), and the resulting solids were collected by filtrationto give(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (40) as an off-white solid (0.509 g, 94%): ¹H NMR (300MHz, DMSO-d₆) δ 13.18 (br s, 1H), 9.31 (br s, 2H), 7.38-7.23 (m, 3H),4.69-4.65 (m, 2H), 4.49-4.21 (m, 2H), 3.39-3.11 (m, 4H), 2.99-2.84 (m,3H), 1.94-1.54 (m, 4H); ESI MS m/z 363 [M+H]+.

Preparation(4-(2-Chloro-3-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1Hpyrazolo[4,3-c]pyridin-3-yl)methanone Hydrochloride (42)

Step A: To a solution of 4-(2-chloro-3-fluorophenyl)piperidinehydrochloride (14, 90 mg, 0.36 mmol),5-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridine-3-carboxylicacid (96 mg, 0.36 mmol), and diisopropylethylamine (0.19 mL, 1.08 mmol)in DMF (7.8 mL) was added EDCI (83 mg, 0.43 mmol) and HOBt (58 mg, 0.43mmol). The resulting solution was stirred at ambient temperature for 24h. The reaction mixture was diluted with H₂O (30 mL), and the resultingprecipitate was collected by filtration. The obtained solids werechromatographed over silica gel (Isco CombiFlash Rf unit, 12 g Redisepcolumn, 0% to 5% CH₃OH in CH₂Cl₂ with 0.1% NH₄OH in CH₂Cl₂) to providetert-butyl3-(4-(2-chloro-3-fluorophenyl)piperidine-1-carbonyl)-6,7-dihydro-1Hpyrazolo[4,3-c]pyridine-5(4H)-carboxylate(41) as a white foam (139 mg, 82%): ¹H NMR (500 MHz, DMSO-d₆) δ13.11-12.91 (m, 1H), 7.39-7.32 (m, 1H), 7.30-7.22 (m, 2H), 5.28-5.13 (m,1H), 4.75-4.60 (m, 1H), 4.49-4.36 (m, 2H), 3.65-3.53 (m, 2H), 3.33-3.25(m, 1H, overlaps with H₂O), 3.24-3.08 (m, 1H), 2.91-276 (m, 1H), 2.67(t, J=5.5 Hz, 2H), 1.91-1.75 (m, 2H), 1.67-1.50 (m, 2H), 1.41 (s, 9H);ESI MS m/z 463 [M+H]+.

Step B: To a solution of tert-butyl3-(4-(2-chloro-3-fluorophenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate(41, 125 mg, 0.27 mmol) in CH₂Cl₂ (2 mL) was added HCl (2.0 N solutionin Et₂O, 2 mL). The mixture was stirred for 18 h at ambient temperature.The reaction mixture was diluted with Et₂O (20 mL) and the resultingsolids were collected by filtration to give(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride as a white solid (42, 93 mg, 86%): ¹H NMR (300 MHz,DMSO-d₆) δ 9.37 (br s, 2H), 7.42-7.21 (m, 3H), 5.31-5.13 (m, 1H),4.74-4.57 (m, 1H), 4.25-4.14 (m, 2H), 3.44-3.14 (m, 4H, overlaps withH₂O), 3.00-2.75 (m, 3H), 1.93-1.77 (m, 2H), 1.70-1.47 (m, 2H) missingN—H pyrazole; ESI MS m/z 363 [M+H]+.

Preparation(4-(5-Fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneHydrochloride (44)

Step A: To a solution of4-(5-fluoro-2-(trifluoromethyl)phenyl)piperidine hydrochloride (11, 93mg, 0.33 mmol),6-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylicacid (88 mg, 0.33 mmol), and diisopropylethylamine (0.17 mL, 0.99 mmol)in DMF (6.0 mL) was added EDCI (76 mg, 0.40 mmol) and HOBt (54 mg, 0.40mmol). The resulting solution was stirred at ambient temperature for 24h. The reaction mixture was diluted with H₂O (10 mL) and extracted withEtOAc (3×30 mL). The combined organic extracts were washed with asaturated brine solution (4×20 mL) and concentrated to dryness underreduced pressure. The obtained residue was chromatographed over silicagel (Isco CombiFlash Rf unit, 12 g Redisep column, 0% to 5% MeOH inCH₂Cl₂ with 0.1% NH₄OH in CH₂Cl₂) to provide tert-butyl3-(4-(5-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate(43) as a white film (110 mg, 67%): ¹H NMR (300 MHz, DMSO-d₆) δ13.16-12.76 (m, 1H), 7.82-7.71 (m, 1H), 7.62-7.50 (m, 1H), 7.33-7.18 (m,1H), 4.92-4.76 (m, 1H), 4.74-4.59 (m, 1H), 4.53-4.39 (m, 2H), 3.54 (t,J=5.7 Hz, 2H), 3.21-3.01 (m, 2H), 2.86-2.69 (m, 1H), 2.66-2.53 (m, 2H),1.83-1.62 (m, 4H), 1.42 (s, 9H); ESI MS m/z 497 [M+H]+.

Step B: To a solution of tert-butyl3-(4-(5-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate(43, 107 mg, 0.21 mmol) in CH₂Cl₂ (2 mL) was added HCl (2N in Et₂O, 2mL). The mixture stirred for 18 h at ambient temperature. The reactionmixture was diluted with Et₂O (20 mL) and the resulting solids werecollected by filtration to provide(4-(5-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (44) as a white solid (66 mg, 71%): ¹H NMR (500 MHz,DMSO-d₆) δ 13.52-13.13 (m, 1H), 9.41 (br s, 2H), 7.77 (dd, J=9.0, 5.7Hz, 1H), 7.62-7.50 (m, 1H), 7.32-7.21 (m, 1H), 5.00-4.83 (m, 1H),4.75-4.58 (m, 1H), 4.37-4.19 (m, 2H), 3.41-3.24 (m, 2H, overlaps withH₂O), 3.22-3.04 (m, 2H), 2.94-2.73 (m, 3H), 1.86-1.64 (m, 4H); ESI MSm/z 397 [M+H]+.

Preparation(4-(5-Fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneHydrochloride (46)

Step A To a solution of 4-(5-fluoro-2-trifluoromethyl)phenylpiperidinehydrochloride (11, 90 mg, 0.32 mmol),5-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridine-3-carboxylicacid (85 mg, 0.32 mmol), and diisopropylethylamine (0.17 mL, 0.96 mmol)in DMF (5.8 mL) was added EDCI (74 mg, 0.38 mmol) and HOBt (52 mg, 0.38mmol). The resulting solution was stirred at ambient temperature for 24h. The reaction mixture was diluted with H₂O (10 mL) and extracted withEtOAc (3×30 mL). The combined organic extracts were washed with asaturated brine solution (4×20 mL) and concentrated to dryness underreduced pressure. The obtained residue was chromatographed over silicagel (Isco CombiFlash Rf unit, 12 g Redisep column, 0% to 5% MeOH inCH₂Cl₂ with 0.1% NH₄OH in CH₂Cl₂) to provide tert-butyl3-(4-(5-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate(45) as a white film (120 mg, 80%): ¹H NMR (300 MHz, DMSO-d₆) δ 12.96(br s, 1H), 7.76 (dd, J=9.0, 5.7 Hz, 1H), 7.61-7.51 (m, 1H), 7.30-7.18(m, 1H), 5.34-5.16 (m, 1H), 4.76-4.58 (m, 1H), 4.53-4.38 (m, 2H),3.65-3.52 (m, 2H), 3.22-3.01 (m, 2H), 2.60-2.43 (m, 3H, overlaps withsolvent), 1.83-1.65 (m, 4H), 1.42 (s, 9H); ESI MS m/z 497 [M+H]+.

Step B: To a solution of tert-butyl3-(4-(5-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate(45, 120 mg, 0.24 mmol) in CH₂Cl₂ (2 mL) was added HCl (2N in Et₂O, 2mL). The mixture stirred for 18 h at ambient temperature. Additional HCl(2N in Et₂O, 1 mL) was added and the mixture was stirred at ambienttemperature for 3 h. The reaction mixture was diluted with Et₂O (20 mL)and the resulting solids were collected by filtration to provide(4-(5-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (46) as a white solid (104 mg, 99%): ¹H NMR (300 MHz,DMSO-d₆) δ 9.54-9.19 (m, 2H), 7.84 (dd, J=9.0, 5.7 Hz, 1H), 7.60-7.51(m, 1H), 7.32-7.20 (m, 1H), 5.32-5.12 (m, 1H), 4.78-4.60 (m, 1H),4.29-4.16 (m, 2H), 3.43-3.30 (m, 2H, overlaps with H₂O), 3.26-3.06 (m,2H), 2.95 (t, J=5.4 Hz, 2H), 2.89-2.72 (m, 1H), 1.84-1.65 (m, 4H)missing N—H pyrazole; ESI MS m/z 397 [M+H]+.

Preparation(4-(2-Chloro-5-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneHydrochloride(48)

Step A: To a solution of 4-(2-chloro-5-fluorophenyl)piperidinehydrochloride (17, 70 mg, 0.28 mmol),6-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylicacid (104 mg, 0.39 mmol), and diisopropylethylamine (0.15 mL, 0.84 mmol)in DMF (5.4 mL) was added EDCI (65 mg, 0.34 mmol) and HOBt (45 mg, 0.34mmol). The resulting solution was stirred at ambient temperature for 18h. The reaction mixture was diluted with H₂O (20 mL) and extracted withEtOAc (4×20 mL). The combined organic extracts were washed with asaturated brine solution (9×20 mL), H₂O (2×20 mL) and concentrated todryness under reduced pressure. The obtained residue was chromatographedover silica gel (Isco CombiFlash Rf unit, 12 g Redisep column, 0% to100% EtOAc in hexanes) to provide tert-butyl3-(4-(2-chloro-5-fluorophenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate(47) as a white solid (57 mg, 44%): ¹H NMR (300 MHz, DMSO-d₆) δ13.16-12.78 (m, 1H), 7.48 (dd, J=9.0, 5.7 Hz, 1H), 7.28 (dd, J=10.5, 3.3Hz, 1H), 7.17-7.05 (m, 1H), 4.90-4.59 (m, 2H), 4.53-4.40 (m, 2H),3.62-3.48 (m, 2H), 3.28-3.07 (m, 2H), 2.92-2.73 (m, 1H), 2.64-2.50 (m,2H, overlaps with solvent), 1.93-1.69 (m, 2H), 1.68-1.49 (m, 2H), 1.42(S, 9H); ESI MS m/z 463 [M+H]+.

Step B: To a solution of tert-butyl 3-(4-(2-chloro-5-fluorophenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate(47, 57 mg, 0.12 mmol) in CH₂Cl₂ (2 mL) was added HCl (2N in Et₂O, 2mL). The mixture stirred for 18 h at ambient temperature. The reactionmixture was concentrated under reduced pressure to yield(4-(2-chloro-5-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (48) as a white solid (43 mg, 87%): ¹H NMR (300 MHz,DMSO-d₆) δ 9.42 (br s, 2H), 7.49 (dd, J=8.7, 5.4 Hz, 1H), 7.28 (dd,J=10.2, 3.0 Hz, 1H), 7.16-7.07 (m, 1H), 4.71-4.43 (m, 2H), 4.32-4.23 (m,2H), 3.38-3.14 (m, 4H, overlaps with H₂O), 2.91-2.72 (m, 3H), 1.89-1.73(m, 2H), 1.69-1.50 (m, 2H), missing N—H pyrazole; ESI MS m/z 363 [M+H]+.

Preparation(4-(2-Chloro-5-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1Hpyrazolo[4,3-c]pyridin-3-yl)methanone Hydrochloride (50)

Step A: To a solution of 4-(2-chloro-5-fluorophenyl)piperidinehydrochloride (17, 70 mg, 0.28 mmol),5-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridine-3-carboxylicacid (89 mg, 0.34 mmol), and diisopropylethylamine (0.15 mL, 0.84 mmol)in DMF (5.4 mL) was added EDCI (64 mg, 0.34 mmol) and HOBt (45 mg, 0.34mmol). The resulting solution was stirred at ambient temperature for 24h. The reaction mixture was diluted with H₂O (20 mL) and extracted withEtOAc (4×20 mL). The combined organic extracts were washed with asaturated brine solution (8×20 mL), H₂O (20 mL), and concentrated todryness under reduced pressure. The obtained residue was chromatographedover silica gel (Isco CombiFlash Rf unit, 12 g Redisep column, 0% to100% EtOAc in hexanes) to give tert-butyl3-(4-(2-chloro-5-fluorophenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate(49) as a white solid (78 mg, 60%): ¹H NMR (300 MHz, DMSO-d₆) δ 12.96(s, 1H), 7.48 (dd, J=8.7, 5.4 Hz, 1H), 7.34-7.21 (m, 1H), 7.16-7.06 (m,1H), 5.28-5.11 (m, 1H), 4.77-4.57 (m, 1H), 4.53-4.38 (m, 2H), 3.66-3.52(m, 2H), 3.30-3.04 (m, 2H, overlaps with H₂O), 2.92-2.61 (m, 3H),1.92-1.74 (m, 2H), 1.69-1.49 (m, 2H), 1.41 (s, 9H); ESI MS m/z 462[M+H]+.

Step B: To a solution of tert-butyl3-(4-(2-chloro-5-fluorophenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate(49, 78 mg, 0.17 mmol) in CH₂Cl₂ (2 mL) was added HCl (2N in Et₂O, 2mL). The mixture stirred for 18 h at ambient temperature. The reactionmixture was concentrated under reduced pressure to yield(4-(2-chloro-5-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (50) as a white solid (64 mg, 94%): ¹H NMR (300 MHz,DMSO-d₆) δ 9.19 (br s, 2H), 7.49 (dd, J=8.7, 5.4 Hz, 1H), 7.27 (dd,J=10.2, 3.0 Hz, 1H), 7.17-7.07 (m, 1H), 5.34-5.05 (m, 1H), 4.79-4.56 (m,1H), 4.38-4.19 (m, 2H), 3.44-3.07 (m, 4H, overlaps with H₂O), 3.01-2.76(m, 3H), 1.92-1.73 (m, 2H), 1.71-1.50 (m, 2H), missing N—H pyrazole; ESIMS m/z 363 [M+H]+.

Preparation((4-(3,5-Bis(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneHydrochloride (52)

Step A: To a solution of 4-(3,5-bis(trifluoromethyl)phenyl)piperidinehydrochloride (20, 100 mg, 0.31 mmol),6-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylicacid (96 mg, 0.36 mmol), and diisopropylethylamine (0.16 mL, 0.90 mmol)in DMF (5.6 mL) was added EDCI (69 mg, 0.36 mmol) and HOBt (49 mg, 0.36mmol). The resulting solution was stirred at ambient temperature for 18h. The reaction mixture was diluted with H₂O (30 mL) and extracted withEtOAc (3×30 mL). The combined organic extracts were washed with asaturated brine solution (4×30 mL) and concentrated to dryness underreduced pressure. The obtained residue was chromatographed over silicagel (Isco CombiFlash Rf unit, 12 g Redisep column, 0% to 5% CH₃OH inCH₂Cl₂ with 0.1% NH₄OH in CH₂Cl₂) to provide tert-butyl3-(4-(3,5-bis(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate(51) as a white film (76 mg, 45%): ¹H NMR (300 MHz, DMSO-d₆) δ13.13-12.77 (m, 1H), 8.02-7.98 (m, 2H), 7.96-7.91 (m, 1H), 4.91-4.59 (m,2H), 4.53-4.41 (m, 2H), 3.60-3.46 (m, 2H), 3.21-3.03 (m, 2H), 2.85-2.69(m, 1H), 2.63-2.54 (m, 2H, overlaps with solvent), 1.97-1.78 (m, 2H),1.77-1.58 (m, 2H), 1.42 (s, 9H); ESI MS m/z 547 [M+H]+.

Step B: To a solution of tert-butyl3-(4-(3,5-bis(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate(51, 75 mg, 0.14 mmol) in CH₂Cl₂ (1 mL) was added HCl (2N in Et₂O, 1mL). The mixture stirred for 18 h at ambient temperature. The reactionmixture was diluted with Et₂O (50 mL) and concentrated to yield(4-(3,5-bis(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (52) as a yellow solid (79 mg, >99%): ¹H NMR (300 MHz,DMSO-d₆) δ 9.37 (br s, 2H), 8.05-7.86 (m, 3H), 4.75-4.44 (m, 2H),4.39-4.18 (m, 2H), 3.42-3.25 (m, 2H, overlaps with H₂O), 3.20-3.03 (m,2H), 2.95-2.75 (m, 3H), 2.03-1.80 (m, 2H), 1.79-1.62 (m, 2H), missingN—H pyrazole; ESI MS m/z 447 [M+H]+.

Preparation(4-(3,5-Bis(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneHydrochloride (54)

Step A: To a solution of 4-(3,5-bis(trifluoromethyl)phenyl)piperidinehydrochloride (20, 100 mg, 0.30 mmol),5-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridine-3-carboxylicacid (81 mg, 0.30 mmol), and diisopropylethylamine (0.18 mL, 0.90 mmol)in DMF (5.6 mL) was added EDCI (69 mg, 0.36 mmol) and HOBt (49 mg, 0.36mmol). The resulting solution was stirred at ambient temperature for 18h. The reaction mixture was diluted with H₂O (30 mL). The resultingprecipitate was collected by filtration to yield tert-butyl3-(4-(3,5-bis(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate(53) as a white solid (142 mg, 86%): ¹H NMR (300 MHz, DMSO-d₆) δ 12.95(s, 1H), 8.03-7.97 (m, 2H), 7.95-7.90 (m, 1H), 5.31-5.13 (m, 1H),4.76-4.58 (m, 1H), 4.52-4.39 (m, 2H), 3.64-3.53 (m, 2H), 3.20-3.03 (m,2H), 2.87-2.61 (m, 3H), 1.97-1.81 (m, 2H), 1.78-1.58 (m, 2H), 1.41 (s,9H); ESI MS m/z 547 [M+H]+.

Step B: To a solution of tert-butyl3-(4-(3,5-bis(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate(53, 142 mg, 0.26 mmol) in 1:1 MeOH/CH₂Cl₂ (2 mL) was added HCl (2N inEt₂O, 2 mL). The mixture was stirred for 18 h at ambient temperature.The reaction mixture was diluted with Et₂O (20 mL) and the resultingsolids were collected by filtration to give(4-(3,5-bis(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (54) as an off-white solid (127 mg, >99%): ¹H NMR (500MHz, DMSO-d₆) δ 9.28 (br s, 2H), 8.02-7.98 (m, 2H), 7.96-7.92 (m, 1H),5.30-5.09 (m, 1H), 4.78-4.55 (m, 1H), 4.28-4.14 (m, 2H), 3.43-3.28 (m,2H, overlaps with H₂O), 3.26-3.07 (m, 2H), 3.02-2.90 (m, 2H), 2.89-2.75(m, 1H), 2.00-1.82 (m, 2H), 1.80-1.61 (m, 2H), missing N—H pyrazole; ESIMS m/z 447 [M+H]+.

Preparation(4-(2-Fluoro-6-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanone Hydrochloride (56)

Step A: To a solution of4-(2-fluoro-6-(trifluoromethyl)phenyl)piperidine hydrochloride (20, 83mg, 0.29 mmol),6-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylicacid (78 mg, 0.29 mmol), and diisopropylethylamine (0.15 mL, 0.88 mmol)in DMF (6.3 mL) was added EDCI (67 mg, 0.35 mmol) and HOBt (47 mg, 0.35mmol). The resulting solution was stirred at ambient temperature for 18h. The reaction mixture was diluted with H₂O (20 mL) and resultingsolids were collected by filtration. The obtained solids werechromatographed over silica gel (Isco CombiFlash Rf unit, 12 g Redisepcolumn, 0% to 5% MeOH in CH₂Cl₂ with 0.1% NH₄OH in CH₂Cl₂) to providetert-butyl 3-(4-(2-fluoro-6-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate (55) as a clear film (95 mg, 65%): ¹H NMR (300 MHz,DMSO-d₆) δ 13.27-12.72 (m, 1H), 7.63-7.45 (m, 3H), 4.86-4.56 (m, 2H),4.55-4.38 (m, 2H), 3.63-3.43 (m, 2H), 3.27-3.00 (m, 2H), 2.92-2.41 (m,3H, overlaps with solvent), 2.13-1.84 (m, 2H), 1.80-1.61 (m, 2H), 1.42(s, 9H); ESI MS m/z 496 [M+H]+.

Step B: To a solution of tert-butyl3-(4-(2-fluoro-6-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1Hpyrazolo[3,4-c]pyridine-6(7H)-carboxylate (55, 94 mg, 0.19 mmol) inCH₂Cl₂ (3 mL) was added HCl (2N in Et₂O, 3 mL). The mixture was stirredfor 18 h at ambient temperature. The reaction mixture was diluted withEt₂O (20 mL) and the mixture concentrated under reduced pressure toyield(4-(2-fluoro-6-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (56) as a white solid (80 mg, 97%): ¹H NMR (300 MHz,DMSO-d₆) δ 9.39-9.26 (m, 2H), 7.63-7.47 (m, 3H), 4.76-4.40 (m, 1H),4.35-4.25 (m, 2H), 3.78-3.39 (m, 4H), 3.25-3.08 (m, 2H), 2.91-2.78 (m,3H), 2.11-1.88 (m, 2H), 1.81-1.66 (m, 2H); ESI MS m/z 397 [M+H]+.

Preparation(4-(2-Fluoro-6-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneHydrochloride (58)

Step A: To a solution of 4-(3,5-bis(trifluoromethyl)phenyl)piperidinehydrochloride (20, 100 mg, 0.30 mmol),5-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridine-3-carboxylicacid (81 mg, 0.30 mmol), and diisopropylethylamine (0.18 mL, 0.90 mmol)in DMF (5.6 mL) was added EDCI (69 mg, 0.36 mmol) and HOBt (49 mg, 0.36mmol). The resulting solution was stirred at ambient temperature for 18h. The reaction mixture was diluted with H₂O (30 mL). The resultingprecipitate was collected by filtration to yield tert-butyl3-(4-(3,5-bis(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate(53) as a white solid (142 mg, 86%): ¹H NMR (300 MHz, DMSO-d₆) δ 12.95(s, 1H), 8.03-7.97 (m, 2H), 7.95-7.90 (m, 1H), 5.31-5.13 (m, 1H),4.76-4.58 (m, 1H), 4.52-4.39 (m, 2H), 3.64-3.53 (m, 2H), 3.20-3.03 (m,2H), 2.87-2.61 (m, 3H), 1.97-1.81 (m, 2H), 1.78-1.58 (m, 2H), 1.41 (s,9H); ESI MS m/z 547 [M+H]+.

Step B: To a solution of tert-butyl3-(4-(3,5-bis(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate(53, 142 mg, 0.26 mmol) in 1:1 MeOH/CH₂Cl₂ (2 mL) was added HCl (2N inEt₂O, 2 mL). The mixture was stirred for 18 h at ambient temperature.The reaction mixture was diluted with Et₂O (20 mL) and the resultingsolids were collected by filtration to give(4-(3,5-bis(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (54) as an off-white solid (127 mg, >99%): ¹H NMR (500MHz, DMSO-d₆) δ 9.28 (br s, 2H), 8.02-7.98 (m, 2H), 7.96-7.92 (m, 1H),5.30-5.09 (m, 1H), 4.78-4.55 (m, 1H), 4.28-4.14 (m, 2H), 3.43-3.28 (m,2H, overlaps with H₂O), 3.26-3.07 (m, 2H), 3.02-2.90 (m, 2H), 2.89-2.75(m, 1H), 2.00-1.82 (m, 2H), 1.80-1.61 (m, 2H), missing N—H pyrazole; ESIMS m/z 447 [M+H]+.

Preparation(4-(3,5-Difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneHydrochloride (60)

Step A: To a suspension of4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidine hydrochloride (28,500 mg, 1.66 mmol),6-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1Hpyrazolo[3,4-c]pyridine-3-carboxylicacid (443 mg, 1.66 mmol), and diisopropylethylamine (36 μL, 2.04 mmol)in DMF (5 mL) was added HBTU (1.10 g, 2.49 mmol). The resulting mixturewas stirred at ambient temperature for 18 h. the reaction was diluted inH₂O (50 mL) and extracted with EtOAc (3×75 mL). The combined organicextracts were dried over Na₂SO₄, filtered, and concentrated underreduced pressure. The resulting residue was chromatographed over silicagel (40 g Redisep column, 0-100% EtOAc in hexanes) to afford tert-butyl3-(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate (59) as a whitesolid (200 mg, 23%). ¹H NMR (300 MHz, CDCl₃) δ 7.017-6.876 (m, 1H),6.876-6.741 (m, 1H), 5.306 (s, 1H), 4.632 (s, 2H), 3.776-3.581 (m, 2H),2.762-2.631 (m, 2H), 1.986-1.653 (m, 4H), 1.500 (s, 9H), 1.399-1.189 (m,4H).

Step B: To a solution of tert-butyl3-(4-(3,5-difluoro-2-(trifluoro-methyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate(59, 94 mg, 0.19 mmol) in CH₂Cl₂ (3 mL) was added HCl (2.0 N solution inEt₂O, 3 mL). The mixture was stirred for 18 h at ambient temperature.The reaction mixture was diluted with Et₂O (20 mL) and the mixtureconcentrated under reduced pressure to yield(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (60) as a white solid (80 mg, 97%).

Preparation(4-(3,5-Difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(62)

Step A: To a suspension of4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidine hydrochloride (28,500 mg, 1.66 mmol),5-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1Hpyrazolo[3,4-c]pyridine-3-carboxylicacid (443 mg, 1.66 mmol), and diisopropylethylamine (36 L, 2.04 mmol) inDMF (5 mL) was added HBTU (1.10 g, 2.49 mmol). The resulting mixture wasstirred at ambient temperature for 18 h. the reaction was diluted in H₂O(50 mL) and extracted with EtOAc (3×75 mL). The combined organicextracts were dried over Na₂SO₄, filtered, and concentrated underreduced pressure. The resulting residue was chromatographed over silicagel (40 g Redisep column, 0-100% EtOAc in hexanes) to afford tert-butyl3-(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate(61) as a white solid (200 mg, 23%).

Step B: To a solution of tert-butyl3-(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1Hpyrazolo[4,3-c]pyridine-5(4H)-carboxylate (61, 94 mg, 0.19 mmol) inCH₂Cl₂ (3 mL) was added HCl (2.0 N solution in Et₂O, 3 mL). The mixturewas stirred for 18 h at ambient temperature. The reaction mixture wasdiluted with Et₂O (20 mL), washed with saturated NaHCO₃ solution, andthe concentrated under reduced pressure to yield(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(62) as a white solid (80 mg, 97%): ¹H NMR (500 MHz, DMSO-d₆) δ 12.73(s, 1H), 7.487-7.336 (m, 2H), 5.193-5.008 (m, 1H), 4.76-4.58 (br s, 1H),3.75 (s, 2H), 3.25-3.04 (m, 2H), 2.94-2.84 (m, 1H), 2.84-2.71 (br s,1H), 2.60-2.53 (m, 2H), 1.89-1.58 (m, 4H); ESI MS m/z 415.1 [M+H]+.

Example 1 Preparation of1-(3-(4-(3-Fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridin-6(7H)-yl)ethanone(63)

Step A: Following general procedure GP-E1,((4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (30) and acetyl chloride were converted to1-(3-(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridin-6(7H)-yl)ethanoneas a white solid (20 mg, 73%): ¹H NMR (500 MHz, DMSO-d₆) δ 13.18-12.83(m, 1H), 7.73-7.60 (m, 1H), 7.46 (d, J=8.0 Hz, 1H), 7.35-7.26 (m, 1H),4.91-4.49 (m, 4H), 3.71-3.57 (m, 2H), 3.25-3.06 (m, 2H), 2.85-2.48 (m,3H, overlaps with solvent), 2.12-2.05 (m, 3H), 1.83-1.66 (m, 4H); ESI MSm/z 439 [M+H]+.

Example 2 Preparation of (4-(3-Fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(methylsulfonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(64)

Step A: Following general procedure GP-C,(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (32) and methanesulfonyl chloride were converted to(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(methylsulfonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneas a white solid (23 mg, 41%): mp 243-246° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 13.03 (br s, 1H), 7.69-7.60 (m, 1H), 7.46 (d, J=7.5 Hz, 1H), 7.33-7.26(m, 1H), 5.30-5.21 (m, 1H), 4.72-4.62 (m, 1H), 4.41-4.24 (m, 2H),3.52-3.39 (m, 2H), 3.27-3.09 (m, 2H), 2.95 (s, 3H), 2.85-2.74 (m, 3H),1.85-1.61 (m, 4H); ESI MS m/z 475 [M+H]+.

Example 3 Preparation of 3-(4-(3-Fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-[1,2,4]triazolo[4,3-a]pyridine-6-carbonitrile(65)

Step A: To a solution of ethyl6-bromo-[1,2,4]triazolo[4,3-a]pyridine-3-carboxylate (75 mg, 0.28 mmol)in THF (2.3 mL) was added a solution of LiOH.H₂O (23 mg, 0.56 mmol) inH₂O (1.5 mL). The mixture was stirred for 20 min and was neutralizedwith 2N HCl. The mixture was concentrated under reduced pressure. Theobtained residue was diluted in DMF (3.0 mL) under an atmosphere of N₂.To this mixture was added 4-(3-fluoro-2-trifluoromethyl)phenylpiperidinehydrochloride (5, 78 mg, 0.28 mmol),benzotriazole-1-yl-oxy-tris-(dimethylamino)-phosphoniumhexafluorophosphate (245 mg, 0.556 mmol), and diisopropylethylamine (107mg, 0.834 mmol). The mixture was stirred at ambient temperature for 18h. The resulting mixture was diluted with H₂O (20 mL). The mixture wasextracted with EtOAc (4×30 mL). The combined organic layers were washedwith 5% lithium chloride solution (4×20 mL) and concentrated underreduced pressure. The resulting residue was chromatographed over silicagel (Isco CombiFlash Rf unit, 12 g Redisep column, 0% to 50% EtOAc inhexanes) to provide(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanoneas an orange film (87 mg, 66%): ¹H NMR (300 MHz, DMSO-d₆) δ 9.13-9.10(m, 1H), 7.75-7.62 (m, 2H), 7.52-7.46 (m, 1H), 7.38-7.25 (m, 1H),5.30-5.17 (m, 1H), 4.78-4.64 (m, 1H), 3.42-3.28 (m, 3H, overlaps withH₂O), 3.11-2.92 (m, 1H), 1.98-1.70 (m, 4H); ESI MS m/z 471 [M+H]+.

Step B: A solution of(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanone(87 mg, 0.19 mmol) and zinc cyanide (43 mg, 037 mmol) in DMF (2.0 mL)was sparged with Ar for 10 min. To the solution was added Pd(PPh₃)₄ (21mg, 0.019 mmol) the vessel was sealed and heated to 130° C. withmicrowaves for 30 min. The mixture was diluted with saturated sodiumbicarbonate solution (30 mL) and extracted with EtOAc (3×30 mL). Thecombined organic extracts were concentrated to dryness under reducedpressure. The resulting residue was chromatographed over silica gel(Isco CombiFlash Rf unit, 12 g Redisep column, 0% to 70% EtOAc inhexanes) and freeze dried to provide3-(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-[1,2,4]triazolo[4,3-a]pyridine-6-carbonitrileas a white solid (52 mg, 67%): mp 188-190° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 9.54-9.51 (m, 1H), 8.13 (dd, J=9.5, 1.0 Hz, 1H), 7.81 (dd, J=9.5, 1.5Hz, 1H), 7.71-7.65 (m, 1H), 7.48 (d, J=8.0 Hz, 1H), 7.32 (dd, J=12.5,8.5 Hz, 1H), 5.17-5.09 (m, 1H), 4.78-4.70 (m, 1H), 3.44-3.28 (m, 2H,overlaps with H₂O), 3.09-3.00 (m, 1H), 1.97-1.75 (m, 4H); ESI MS m/z 418[M+H]+.

Example 4 Preparation of 3-(4-(3-Fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-N-methyl-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxamide(66)

Step A: Following general procedure GP-E2,((4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (30) and methyl isocyanate were converted to3-(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-N-methyl-6,7-dihydro-1Hpyrazolo[4,3-c]pyridine-5(4H)-carboxamideas a white solid (32 mg, 41%): mp 165-170° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 13.03-12.85 (m, 1H), 7.70-7.62 (m, 1H), 7.46 (d, J=8.0 Hz, 1H), 7.30(dd, J=12.0, 8.0 Hz, 1H), 6.58-6.49 (m, 1H), 5.19-5.06 (m, 2H),4.76-4.62 (m, 2H), 3.63-3.50 (m, 2H), 3.27-3.09 (m, 2H), 2.86-2.72 (m,1H), 2.64 (t, J=5.5 Hz, 2H), 2.59-2.54 (m, 3H), 1.84-1.59 (m, 4H); ESIMS m/z 454 [M+H]+.

Example 5 Preparation of(5-ethyl-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanone (67)

Step A: Following general procedure GP-D,(4-(3-fluoro-2-(trifluoro-methyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (32) and acetaldehyde were converted(5-ethyl-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanoneas a white solid (2.5 mg, 2%): ¹H NMR (500 MHz, CD₃OD) δ7.64-7.53 (m,1H), 7.38 (d, J=8.0 Hz, 1H), 7.13 (dd, J=12.0, 8.5 Hz, 1H), 4.90-4.72(m, 2H, overlaps with H₂O), 3.62 (br s, 2H), 3.34-3.17 (m, 2H, overlapswith solvent), 2.92-2.78 (m, 5H), 2.68 (q, J=7.0 Hz, 2H), 1.96-1.74 (m,4H), 1.20 (t, J=7.5 Hz, 3H) missing NH-pyrazole; ESI MS m/z 425 [M+H]+.

Example 6 Preparation of 3-(4-(3-Fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate(68)

Step A: Following general procedure GP-B1,(4-(3-fluoro-2-(trifluoro-methyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (32) and methyl chloroformate were converted to3-(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylateas a white solid (62 mg, 60%): ¹H NMR (500 MHz, DMSO-d₆) δ 13.11-12.94(m, 1H), 7.68-7.61 (m, 1H), 7.46 (d, J=8.0 Hz, 1H), 7.29 (dd, J=12.5,8.5 Hz, 1H), 5.33-5.16 (m, 1H), 4.74-4.60 (m, 1H), 4.56-4.41 (m, 2H),3.68-3.58 (m, 5H), 3.26-3.08 (m, 2H), 2.85-2.74 (m, 1H), 2.70 (t, J=5.5Hz, 2H), 1.85-1.59 (m, 4H); ESI MS m/z 455 [M+H]+.

Example 7 Preparation of(5-(Cyclopropylmethyl)-4,5,6,7-tetrahydro-1Hpyrazolo[4,3-c]pyridin-3-yl)(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanone(69)

Step A: Following general procedure GP-D1,(4-(3-fluoro-2-(trifluoro-methyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (32) and cyclopropane carboxaldehyde were converted(5-(cyclopropylmethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)(4-(3-fluoro-2-(trifluoro-methyl)phenyl)piperidin-1-yl)methanoneas a white solid (33 mg, 81%): ¹H NMR (500 MHz, DMSO-d₆) δ 12.92-12.73(m, 1H), 7.69-7.61 (m, 1H), 7.45 (d, J=8.0 Hz, 1H), 7.29 (dd, J=12.0,8.5 Hz, 1H), 5.13-5.00 (m, 1H), 4.73-4.60 (m, 1H), 3.60-3.46 (m, 2H),3.25-3.03 (m, 2H), 2.83-2.64 (m, 5H), 2.41-2.33 (m, 2H), 1.85-1.59 (m,4H), 0.94-0.83 (m, 1H), 0.52-0.44 (m, 2H), 0.14-0.08 (m, 2H); ESI MS m/z451 [M+H]+.

Example 8 Preparation of 3-(4-(3-Fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carbonitrile(70)

Step A: Following general procedure GP-D2, (4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (32) and cyanogen bromide were converted to3-(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carbonitrileas a white solid (35 mg, 70%): ¹H NMR (500 MHz, DMSO-d₆) δ13.26-13.05(m, 1H), 7.68-7.61 (m, 1H), 7.61 (d, J=8.0 Hz, 1H), 7.32 (dd, J=12.5,8.5 Hz, 1H), 5.32-5.20 (m, 1H), 4.71-4.61 (m, 1H), 4.44-4.29 (m, 2H),3.46 (t, J=5.5 Hz, 2H), 3.27-3.09 (m, 2H), 2.87-2.73 (m, 3H), 1.85-1.59(m, 4H); ESI MS m/z 422 [M+H]+.

Example 9 Preparation of (4-(3-Fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(2,2,2-trifluoroethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(71)

Step A: Following general procedure GP-D2, (4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (32) and 2,2,2-trifluoroethyl trifluoromethanesulfonatewere converted to(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(2,2,2-trifluoroethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone as a white solid (71 mg, 64%): mp 144-151° C.; ¹H NMR (500MHz, DMSO-d₆) δ 12.99-12.81 (m, 1H), 7.68-7.61 (m, 1H), 7.45 (d, J=8.0Hz, 1H), 7.38-7.26 (m, 1H), 5.20-5.08 (m, 1H), 4.69-4.61 (m, 1H),3.82-3.69 (m, 2H), 3.50-3.30 (m, 2H, overlaps with H₂O), 3.24-3.06 (m,2H), 2.92 (t, J=6.5 Hz, 2H), 2.83-2.73 (m, 1H), 2.70 (t, J=5.5 Hz, 2H),1.86-1.58 (m, 4H); ESI MS m/z 479 [M+H]+.

Example 10 Preparation of (4-(3-Fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(3,3,3-trifluoropropyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(72)

Step A: Following general procedure GP-D2,(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (32) and 3-bromo-1,1,1-trifluoropropane were converted to(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(3,3,3-trifluoropropyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneas a white solid (26 mg, 32%): mp 152-159° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 12.93-12.75 (m, 1H), 7.69-7.61 (m, 1H), 7.47-7.43 (m, 1H), 7.29 (dd,J=12.0, 8.5 Hz, 1H), 5.11-5.00 (m, 1H), 4.71-4.62 (m, 1H), 3.58-3.44 (m,2H), 3.25-3.06 (m, 2H), 2.83-2.61 (m, 7H), 2.58-2.46 (m, 1H, overlapswith solvent), 1.84-1.59 (m, 4H); ESI MS m/z 493 [M+H]+.

Example 11 Preparation of (4-(3-Fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(2-methoxyethyl)-4,5,6,7-tetrahydro-3aH-pyrazolo4,3-c]pyridin-3-yl)methanone (73)

Step A: Following general procedure GP-G2, ((4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (30) and bromoethylmethyl ether were converted to4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-yl)(5-(2-methoxyethyl)-4,5,6,7-tetrahydro-3aH-pyrazolo[4,3-c]pyridin-3-yl)methanoneas an off-white solid (28 mg, 56%): mp 147-151° C.; ¹H NMR (300 MHz,DMSO-d₆) δ 2.82 (br s, 1H), 7.65-7.27 (m, 3H), 5.18-5.09 (m, 1H),4.75-4.60 (m, 1H), 3.51-3.45 (m, 2H), 3.27-3.11 (m, 6H), 2.84-2.70 (m,8H), 1.87-1.63 (m, 4H); ESI MS m/z 475 [M+H]+.

Example 12 Preparation of 4-(3-Fluoro-2-(trifluoromethyl)phenyl)piperidine-1-yl)(5-(oxetan-3-yl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(74)

Step A: Following general procedure GP-D1,(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (32) and 3-oxetanone were converted to4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-yl)(5-(oxetan-3-yl)-4,5,6,7-tetrahydro-1Hpyrazolo[4,3-c]pyridin-3-yl)methanoneas a white foam (30 mg, 29%): ¹H NMR (300 MHz, CDCl₃) δ 10.04 (br s,1H), 7.48-7.42 (m, 1H), 7.20-7.17 (m, 1H), 7.06-7.02 (m, 1H), 5.22-4.81(m, 2H), 4.74 (d, J=6.6 Hz, 4H), 3.89-3.81 (m, 1H), 3.62 (br s, 2H),3.31-3.24 (m, 1H), 3.21-2.68 (m, 5H), 1.91-1.72 (m, 5H); ESI MS m/z 453[M+H]+.

Example 13 Preparation of(6-Ethyl-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)(4-(3-fluoro-2-(trifluormethyl)phenyl)piperidin-1-yl)methanone(75)

Step A: Following general procedure GP-G1,((4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (30) and acetaldehyde were converted to(6-ethyl-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)(4-(3-fluoro-2-(trifluormethyl)phenyl)piperidin-1-yl)methanone as a white solid (21 mg, 31%): ¹H NMR (300 MHz,DMSO-d₆) δ 12.74 (br s, 1H), 7.72-7.65 (m, 1H), 7.48-7.27 (m, 2H),4.92-4.63 (m, 2H), 3.68-3.04 (m, 4H), 2.90-2.39 (m, 7H), 1.74-1.55 (m,4H), 1.18-1.02 (m, 3H); ESI MS m/z 425 [M+H]+.

Example 14 Preparation of (4-(3-Fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(6-(3,3,3-trifluoropropyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanone(76)

Step A: Following general procedure GP-G1,((4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (30) and bromotrifluoromethyl propane were converted to4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(6-(3,3,3-trifluoropropyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneas a white solid (19 mg, 15%): mp 162-166° C.; ¹H NMR (300 MHz, DMSO-d₆)δ 12.78 (br s, 1H), 7.72-7.65 (m, 1H), 7.48-7.27 (m, 2H), 4.92-4.63 (m,2H), 3.57-3.53 (m, 2H), 3.27-3.09 (m, 2H), 2.88-2.39 (m, 9H), 1.77-1.72(m, 4H); ESI MS m/z 493 [M+H]+.

Example 15 Preparation of (4-(3-Fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(6-(2-methoxyethyl)-4,5,6,7-tetrahydro-3aH-pyrazolo[3,4-c]pyridin-3-yl)methanone(77)

Step A: Following general procedure GP-G1,((4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (30) and bromoethylmethyl ether were converted4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-yl)(6-(2-methoxyethyl)-4,5,6,7-tetrahydro-3aH-pyrazolo[3,4-c]pyridin-3-yl)methanoneas a white solid (23 mg, 30%): ¹H NMR (300 MHz, DMSO-d₆) δ 12.72 (br s,1H), 7.67-7.62 (m, 1H), 7.46 (d, J=8.1 Hz, 1H), 7.33-7.27 (m, 1H),4.92-4.63 (m, 2H), 3.57-3.48 (m, 4H), 3.27-3.05 (m, 5H), 2.81-2.49 (m,7H), 1.77-1.72 (m, 4H); ESI MS m/z 455 [M+H]+.

Example 16 Preparation of 3-(4-(3-Fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carbonitrile(78)

Step A: Following general procedure GP-G2,((4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (30) and cyanogen bromide were converted to3-(4-(3-fluoro-2-(trifluormethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carbonitrileas a white solid (38 mg, 53%): mp 194-198° C.; ¹H NMR (300 MHz, DMSO-d₆)δ 12.98 (br s, 1H), 7.68-7.65 (m, 1H), 7.47 (d, J=7.8 Hz, 1H), 7.34-7.27(m, 1H), 4.92-4.63 (m, 2H), 4.48-4.40 (m, 2H), 3.43-3.38 (m, 2H),3.27-3.05 (m, 2H), 2.88-2.71 (m, 3H), 1.77-1.72 (m, 4H); ESI MS m/z 422[M+H]+.

Example 17 Preparation of (4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(6-oxetan-3-yl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-yl)methanone(79)

Step A: Following general procedure GP-G1,((4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (30) and oxetan-3-one were converted to(4-(3-fluoro-2-(trifluormethyl)piperidine-1-yl)(6-oxetan-3-yl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-yl)methanoneas a white solid (30 mg, 39%): mp 148-151° C.; ¹H NMR (300 MHz, DMSO-d₆)δ 12.77 (br s, 1H), 7.70-7.63 (m, 1H), 7.47 (d, J=8.1 Hz, 1H), 7.34-7.27(m, 1H), 4.91-4.47 (m, 6H), 3.71-3.66 (m, 1H), 3.47-3.34 (m, 2H),3.28-3.06 (m, 2H), 2.93-2.78 (m, 1H), 2.74-2.53 (m, 2H), 1.91-1.78 (m,2H), 1.89-1.55 (m, 4H); ESI MS m/z 453 [M+H]+.

Example 18 Preparation of(6-(cyclopropylmethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanone(80)

Step A: Following general procedure GP-G1,((4-(3-fluoro-2-(trifluoro-methyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (30) and cyclopropane carbaldehyde were converted to(6-ethyl-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)(4-(3-fluoro-2-(trifluormethyl)phenyl)piperidin-1-yl)methanone as a white solid (23 mg, 34%): ¹H NMR (300 MHz,DMSO-d₆) δ 12.74 (br s, 1H), 7.72-7.65 (m, 1H), 7.47 (d, J=7.8 Hz, 1H),7.34-7.27 (m, 1H), 4.92-4.63 (m, 2H), 3.59-3.53 (m, 2H), 3.32-3.09 (m,2H), 2.90-2.39 (m, 7H), 1.81-1.62 (m, 4H), 0.92-0.85 (m, 1H), 0.52-0.48(m, 2H), 0.14-0.10 (m, 2H); ESI MS m/z 451 [M+H]+.

Example 19 1-(3-(4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridin-6(7H)-yl)ethanone(81)

Step A: Following general procedure GP-G1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneTFA salt (34) and acetyl chloride were converted to give1-(3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridin-6(7H)-yl)ethanoneas a white solid (29.2 g, 80%): ¹H NMR (500 MHz, CDCl₃) δ10.59 (br, 1H),7.36-7.29 (m, 1H), 7.15 (m, 1H), 4.81 (br, 2H), 4.77 and 4.65 (s, 2H),3.85 (br, 1H), 3.68 (m, 1H), 3.26-2.69 (m, 5H), 2.21 and 2.19 (s, 3H),1.89-1.73 (m, 4H) MS (ESI+) m/z 457 [M+H]+.

Example 20 1-(3-(4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridin-5(4H)-yl)ethanone(82)

Step A: Following general procedure GP-B1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-H-pyrazolo[4,3-c]pyridin-3-yl)methanone(36) and acetyl chloride were converted to1-(3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridin-5(4H)-yl)ethanoneas a white solid (0.046 g, 85): ¹H NMR (300 MHz, CDCl₃) δ 10.15 (br,1H), 7.36-7.27 (m, 1H), 7.15 (m, 1H), 5.33-4.72 (m, 4H), 3.90-3.73 (m,2H), 3.30-2.76 (m, 5H), 2.20 (s, 3H), 1.89-1.70 (m, 4H); MS (ESI+) m/z457 [M+H]+.

Example 21 1-(3-(4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)pyrrolo[3,4-c]pyrazol-5(1H,4H,6H)-yl)ethanone (83)

Step A: Following general procedure GP-B1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and acetyl chloride were converted to1-(3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)pyrrolo[3,4-c]pyrazol-5(1H,4H,6H)-yl)ethanoneas a white solid (0.045 g, 72%): ¹H NMR (500 MHz, CDCl₃) δ10.92 (br,1H), 7.37-7.32 (m, 1H), 7.12 (m, 1H), 4.81-4.21 (m, 6H), 3.29-2.88 (m,3H), 2.18 and 2.16 (s, 3H), 1.97-1.70 (m, 4H); MS (ESI+) m/z 443 [M+H]+

Example 22 Preparation of 1-(3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)pyrrolo[3,4-c]pyrazol-5(1H,4H,6H)-yl)propan-1-one(84)

Step A: Following general procedure GP-H1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and propionyl chloride were converted to1-(3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)pyrrolo[3,4-c]pyrazol-5(1H,4H,6H)-yl)propan-1-oneas a white solid (37 mg, 51%): mp>260° C.; ¹H NMR (500 MHz, CDCl₃) δ7.38-7.30 (m, 1H), 7.13-7.10 (m, 1H), 4.99-4.61 (m, 5.5H), 4.46-4.19 (m,0.5H), 3.46-2.72 (m, 3H), 2.42-2.35 (m, 2H), 1.99-1.92 (m, 2H),1.82-1.57 (m, 2H), 1.35-1.16 (m, 3H), missing N—H pyrazole; ESI MS m/z457 [M+H]+.

Example 23 Preparation of 1-(3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl) pyrrolo[3,4-c]pyrazol5(1H,4H,6H)-yl)-2-methylpropan-1-one (85)

Step A: Following general procedure GP-H1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo(3,4-c]pyrazol-3-yl)methanone (38) and isobutyryl chloride wereconverted to 1-(3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)pyrrolo[3,4-c]pyrazol-5(1H,4H,6H)-yl)-2-methylpropan-1-one as a white solid (29 mg, 38%): mp 249-253° C.; ¹H NMR (500MHz, DMSO-d₆) δ 13.21, (br s, 1H), 7.81-7.68 (m, 1H), 7.57-7.47 (m, 1H),4.83-3.65 (m, 6H), 3.29-2.67 (m, 4H), 1.82-1.61 (m, 4H), 1.05 (d, J=9Hz, 6H); ESI MS m/z 471 [M+H]+.

Example 24 Preparation of1-(3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)pyrrolo[3,4-c]pyrazol-5(1H,4H, 6H)-yl)-3-methylbutan-1-one (86)

Step A: Following general procedure GP-H1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and isovaleryl chloride were converted to1-(3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)pyrrolo[3,4-c]pyrazol-5(1H,4H,6H)-yl)-3-methylbutan-1-oneas a white solid (42 mg, 54%): ¹H NMR (500 MHz, CDCl₃) δ 7.37-7.28 (m,1H), 7.17-7.08 (m, 1H), 4.95-4.53 (m, 5.5H), 4.43-3.90 (m, 0.5H),3.34-2.70 (m, 3H), 2.30-2.19 (m, 3H), 1.98-1.89 (m, 2H), 1.80-1.58 (m,2H), 1.05-0.94 (m, 6H) missing N—H pyrazole; ESI MS m/z 485 [M+H]+.

Example 25 Preparation of(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-ethyl-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(87)

Step A: Following general procedure GP-D1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone (36) and acetaldehyde were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-ethyl-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone as a white solid (35 mg, 36%): mp 185-190° C.; ¹H NMR (300MHz, DMSO-d₆) δ 12.793 (s, 1H), 7.903-7.609 (m, 1H), 7.60-7.40 (m, 1H),5.24-4.93 (m, 1H), 4.85-4.49 (m, 1H), 3.45 (s, 2H), 3.13 (s, 2H),2.96-2.71 (m, 1H), 2.61 (s, 4H), 2.58-2.52 (m, 1H), 1.84-1.57 (br s,4H), 1.19-0.97 (t, 3H); ESI MS m/z 433.1 [M+H]+.

Example 26 Preparation of(5-(cyclopropylmethyl)-4,5,6,7-tetrahydro-1Hpyrazolo[4,3-c]pyridin-3-yl)(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanone(88)

Step A: Following general procedure GP-D1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(36) and cyclopropane carboxaldehyde were converted to(5-(cyclopropylmethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)(4-(3,4-difluoro-2-(tri-fluoromethyl)phenyl)piperidin-1-yl)methanoneas a white solid (38 mg, 37%): No clear melt observed; ¹H NMR (500 MHz,DMSO-d₆) δ 12.80 (s, 1H), 7.80-7.66 (m, 1H), 7.54-7.45 (m, 1H),5.19-5.03 (br s, 1H), 4.73-4.58 (m, 1H), 3.66-3.46 (br s, 1H), 3.22-3.05(br s, 2H), 2.85-2.63 (m, 4H), 1.83-1.59 (br s, 4H), 0.99-0.82 (br s,1H), 0.58-0.43 (m, 2H), 0.21-0.07 (br s, 2H); ESI MS m/z 469.2 [M+H]+.

Example 27 Preparation of(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(oxetan-3-yl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(89)

Step A: Following general procedure GP-D1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(36) and 3-oxetanone were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(oxetan-3-yl)-4,5,6,7-tetrahydro-Hpyrazolo[4,3-c]pyridin-3-yl)methanoneas a white solid (28 mg, 27%): mp 212-215° C.; ¹H NMR (300 MHz, DMSO-d₆)δ 12.847 (s, 1H), 7.796-7.684 (m, 1H), 7.546-7.458 (m, 1H), 5.151 (d,1H), 4.737-4.554 (m, 3H), 4.554-4.423 (m, 2H), 3.755-3.600 (m, 1H),3.379 (s, 2H), 3.222-3.050 (br s, 2H), 2.844-2.643 (m, 3H), 1.898-1.515(br s, 4H); ESI MS m/z 471.2 [M H]+.

Example 28 Preparation of(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-neopentyl-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonemethanone (90)

Step A: Following general procedure GP-D1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(36) and pivaldehyde were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-neopentyl-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone methanone as a white solid (11 mg, 10%): mp 203-210° C.; ¹HNMR (500 MHz, DMSO-d₆) δ 12.789 (s, 1H), 7.821-7.681 (m, 1H),7.553-7.424 (m, 1H), 5.216-5.064 (br s, 1H), 4.755-4.579 (br s, 1H),3.686-3.546 (m, 2H), 3.172-3.070 (m, 2H), 2.845-2.710 (m, 1H), 2.249 (s,2H), 1.799-1.612 (m, 4H), 0.864 (s, 9H); ESI MS m/z 485.2 [M H]+.

Example 29 Preparation of methyl3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate(91)

Step A: Following general procedure GP-B1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(36) and methyl chloroformate were converted to methyl3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylateas a white solid (21 mg, 20%): mp 248-252° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 12.924 (s, 1H), 7.763-7.692 (m, 1H), 7.540-7.472 (m, 1H), 5.358-5.152(br s, 1H), 4.754-4.605 (br s, 1H), 4.650-4.418 (m, 2H), 3.705-3.581 (m,6H), 3.119-3.100 (m, 3H), 2.860-2.731 (m, 4H), 1.296-1.237 (m, 6H); ESIMS m/z 473.1 [M+H]+.

Example 30 Preparation of3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-N-methyl-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxamide(92)

Step A: Following general procedure GP-B2,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(36) and methyl isocyanate were converted to3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-N-methyl-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxamideas a white solid (28 mg, 36%): No clear melt observed; ¹H NMR (500 MHz,DMSO-d₆) δ 12.895 (s, 1H), 7.780-7.692 (m, 1H), 7.538-7.472 (m, 1H),6.579-6.490 (m, 1H), 5.202-5.086 (m, 1H), 4.743-4.622 (m, 1H),4.465-4.332 (m, 2H), 3.630-3.499 (m, 2H), 3.209-3.095 (m, 2H),2.849-2.730 (m, 1H), 2.673-2.602 (m, 2H), 2.602-2.542 (m, 3H),1.912-1.588 (m, 5H); ESI MS m/z 472.2 [M+H]+.

Example 31 Preparation of(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(3,3,3-trifluoropropyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(93)

Step A: Following general procedure GP-D2,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(36) and 1,1,1-trifluoro-3-bromopropane were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(3,3,3-trifluoropropyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneas a white solid (24 mg, 21%): mp 190-195° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 12.939-12.764 (m, 1H), 7.847-7.665 (m, 1H), 7.591-7.417 (m, 1H),5.213-4.965 (m, 1H), 4.729-4.555 (m, 1H), 3.637-3.456 (m, 2H),3.223-3.039 (br s, 2H), 2.853-2.698 (m, 5H), 2.698-2.623 (m, 2H),2.596-2.522 (m, 1H), 1.859-1.589 (m, 4H); ESI MS m/z 511.1 [M+H]+.

Example 32 Preparation of(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(2-methoxyethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(94)

Step A: Following general procedure GP-D2,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(36) and 2-methoxybromoethane were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(2-methoxyethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneas a white solid (24 mg, 23%): mp 179-182° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 12.805 (s, 1H), 7.824-7.654 (m, 1H), 7.563-7.438 (m, 1H), 5.085 (s,1H), 4.660 (s, 1H), 3.517 (s, 4H), 3.268 (s, 3H), 3.187-3.063 (m, 2H),2.906-2.604 (m, 6H), 1.885-1.550 (m, 4H); ESI MS m/z 473.2 [M+H]+.

Example 33 Preparation of3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carbonitrile(95)

Step A: Following general procedure GP-D2,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(36) and cyanogen bromide were converted to3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carbonitrileas a white solid (95 mg, quant.): No clear melt observed; ¹H NMR (500MHz, DMSO-d₆) δ 13.115 (s, 1H), 7.833-7.627 (m, 1H), 7.627-7.409 (m,1H), 5.188-5.067 (m, 1H), 4.558-4.469 (m, 1H), 4.374 (s, 2H),3.538-3.404 (m, 2H), 3.074-2.98 (br s, 2H), 2.877-2.805 (m, 2H),1.801-1.694 (br s, 4H); ESI MS m/z 440 [M+H]+.

Example 34 Preparation of (4-(3,4-difluoro-2(trifluoromethyl)phenyl)piperidin-1-yl)(5-ethyl-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(96)

Step A: Following general procedure GP-J1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and acetaldehyde were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-ethyl-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanoneas a white solid (36 mg, 76%): No clear melt observed; ¹H NMR (500 MHz,DMSO-d₆) δ 13.140-12.832 (m, 1H), 7.879-7.669 (m, 1H), 7.669-7.408 (m,1H), 5.271-3.901 (m, 2H), 3.901-3.559 (m, 4H), 3.216-3.013 (m, 2H),2.960-2.684 (m, 3H), 1.854-1.569 (m, 4H), 1.162-1.005 (m, 3H); ESI MSm/z 429.2 [M+H]+.

Example 35 Preparation of (5-(cyclopropylmethyl)-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanone(97)

Step A: Following general procedure GP-J1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and cyclopropropane carboxaldehyde were converted to((5-(cyclopropylmethyl)-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanone as a white solid (36 mg, 76%): No clear meltobserved; ¹H NMR (500 MHz, DMSO-d₆) δ 13.101-12.818 (m, 1H), 7.887-7.665(m, 1H), 7.665-7.423 (m, 1H), 5.223-3.923 (m, 2H), 3.923-3.594 (m, 4H),3.258-3.667 (m, 3H), 2.667-2.533 (m, 2H), 1.827-1.606 (m, 4H),0.988-0.793 (m, 1H), 0.598-0.417 (m, 2H), 0.235-0.087 (m, 2H); ESI MSm/z 455.1 [M+H]+.

Example 36 Preparation of(5-(cyclopropylmethyl)-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanone(98)

Step A: Following general procedure GP-J1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and 3-oxetanone were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(oxetan-3-yl)-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone as a white solid (39 mg, 74%): No clear melt observed; 1H NMR(500 MHz, DMSO-d₆) δ 13.105-12.925 (m, 1H), 7.874-7.651 (m, 1H),7.602-7.442 (m, 1H), 5.250-4.509 (m, 1H), 4.245-3.601 (m, 5H),3.221-3.074 (m, 1H), 3.016-2.723 (m, 3H), 2.596-2.518 (m, 2H),1.854-1.610 (m, 4H); ESI MS m/z 457.1 [M+H]+.

Example 37 Preparation of(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-neopentyl-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(99)

Step A: Following general procedure GP-J1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and pivaldehyde were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-neopentyl-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanoneas a white solid (25 mg, 46%): No clear melt observed; ¹H NMR (500 MHz,DMSO-d₆) δ 13.060-12.840 (m, 1H), 7.840-7.440 (m, 2H), 5.315-4.473 (m,1H), 4.210-3.642 (m, 5H), 3.272-2.728 (m, 3H), 2.555 (s, 2H),1.867-1.597 (m, 4H), 0.905 (s, 9H); ESI MS m/z 471.2 [M+H]+.

Example 38 Preparation of3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-N-methyl-4,6-dihydropyrrolo[3,4-c]pyrazole-5(1H)-carboxamide(100)

Step A: Following general procedure GP-H2,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and methyl isocyanate were converted to3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-N-methyl-4,6-dihydropyrrolo[3,4-c]pyrazole-5(1H)carboxamide as a white solid (55 mg, 53%): mp>260° C.; ¹H NMR (300 MHz,DMSO-d₆) δ 13.449-12.960 (m, 1H), 7.719-7.620 (m, 1H), 7.620-7.379 (m,1H), 6.272 (s, 1H), 5.454-3.850 (m, 6H), 3.240-2.737 (m, 3H), 2.623 (s,3H), 1.979-1.523 (m, 4H; ESI MS m/z 458.1 [M+H]+.

Example 39 Preparation of methyl3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,6-dihydropyrrolo[3,4-c]pyrazole-5(1H)-carboxylate(101)

Step A: Following general procedure GP-H1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and methyl chloroformate were converted to methyl3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,6-dihydropyrrolo[3,4-c]pyrazole-5(1H)-carboxylateas a white solid (30 mg, 55%): No clear melt observed; ¹H NMR (500 MHz,DMSO-d₆) δ 13.503-13.110 (br s, 1H), 7.310-7.721 (m, 1H), 7.587-7.471(m, 1H), 4.808-4.531 (br s, 1H), 4.531-4.370 (m, 4H), 3.673 (s, 3H),3.277-3.102 (m, 2H), 3.012-2.722 (br s, 1H), 1.851-1.621 (m, 4H); ESI MSm/z 459.2 [M+H]+.

Example 40 Preparation of(5-benzoyl-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanone(102)

Step A: Following general procedure GP-H1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and benzoyl chloride were converted to(5-benzoyl-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanone as a white solid (30 mg, 55%): mp>260° C.; ¹H NMR (500 MHz,DMSO-d₆) δ 13.697-13.007 (m, 1H), 7.867-7.668 (m, 1H), 7.668-7.545 (m,2H), 7.545-7.384 (m, 4H), 5.416-3.891 (m, 6H), 3.248-2.620 (m, 3H),1.923-1.524 (m, 4H); ESI MS m/z 505 [M+H]+.

Example 41 Preparation of (4-(3,4-difluoro-2(trifluoromethyl)phenyl)piperidin-1-yl)(5-picolinoyl-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(103)

Step A: Following general procedure GP-H1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and picolinoyl chloride were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-picolinoyl-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone as a white solid (13 mg, 22%): No clear melt observed; 1H NMR(300 MHz, DMSO-d₆) δ 13.632-13.061 (m, 1H), 8.722-8.139 (m, 1H),8.140-7.908 (m, 1H), 7.908-7.684 (m, 2H), 7.684-7.398 (m, 2H),5.115-4.428 (m, 5H), 3.316-2.598 (m, 3H), 1.927-1.133 (m, 5H); ESI MSm/z, 506.1 [M+H]+.

Example 42 Preparation of(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-nicotinoyl-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(104)

Step A: Following general procedure GP-H1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and nicotinoyl chloride were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-nicotinoyl-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanoneas a white solid (34 mg, 59%): No clear melt observed; ¹H NMR (500 MHz,DMSO-d₆) δ 13.589-13.123 (br s, 1H), 8.807 (s, 1H), 8.140-7.991 (m, 1H),7.843-7.678 (m, 1H), 7.628-7.364 (m, 2H), 5.433-3.721 (m, 6H),3.257-2.701 (m, 3H), 1.933-1.522 (m, 4H); ESI MS m/z 506.1 [M+H]+.

Example 43 Preparation of (4-(3,4-difluoro-2(trifluoromethyl)phenyl)piperidin-1-yl)(5-isonicotinoyl-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(105)

Step A: Following general procedure GP-H1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and isonicotinoyl chloride were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-isonicotinoyl-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone as a white solid (14 mg, 24%): mp>260° C.; ¹H NMR (500 MHz,DMSO-d₆) δ 13.420-13.120 (m, 1H), 8.770-8.620 (m, 2H), 7.833-7.679 (m,1H), 7.612-7.369 (m, 3H), 5.410-3.820 (m, 6H), 3.240-3.060 (m, 2H),1.860-1.530 (m, 4H), 1.290-1.190 (m, 1H); ESI MS m/z 506.1 [M+H]+.

Example 44 Preparation of(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(pyrrolidine-1-carbonyl)-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(106)

Step A: Following general procedure GP-H2,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and 1-pyrolocarbamoyl chloride were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(pyrrolidine-1-carbonyl)-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanoneas a white solid (22 mg, 38%): mp>260° C.; ¹H NMR (500 MHz, DMSO-d₆) δ13.389-13.022 (m, 1H), 7.858-7.407 (m, 2H), 5.439-3.846 (m, 6H),3.412-3.326 (m, 4H), 3.253-2.742 (m, 3H), 1.868-1.638 (m, 8H); ESI MSm/z 498.2 [M+H]+.

Example 45 Preparation of 4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(2,2,2-trifluoroethyl)-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(107)

Step A: Following general procedure GP-J2,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and 2,2,2-trifluoroethyl trifluoromethanesulfonate were convertedto(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(2,2,2-trifluoroethyl)-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanoneas a white solid (16 mg, 28%): No clear melt observed; ¹H NMR (500 MHz,DMSO-d₆) δ 13.274-12.902 (m, 1H), 7.343-7.681 (m, 1H), 7.601-7.441 (m,1H), 5.368-3.811 (m, 6H), 3.695-3.520 (m, 2H), 3.273-2.71 (m, 3H),1.906-1.571 (m, 4H); ESI MS m/z 483.1 [M+H]+.

Example 46 Preparation of (4-(3,4-difluoro-2(trifluoromethyl)phenyl)piperidin-1-yl)(5-(3,3,3-trifluoropropyl)-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(108)

Step A: Following general procedure GP-J2,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and 1,1,1-trifluoro-3-bromopropane were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(3,3,3-trifluoropropyl)-1,4,5,6-tetrahydro-pyrrolo[3,4-c]pyrazol-3-yl)methanoneas a white solid (13 mg, 22%): No clear melt observed; H NMR (500 MHz,DMSO-d₆) δ 13.091-12.860 (m, 1H), 7.837-7.651 (m, 1H), 7.638-7.430 (m,1H), 5.271-4.038 (m, 7H), 3.899-3.673 (m, 4H), 3.210-3.059 (m, 2H),2.955-2.681 (br s, 1H), 1.869-1.558 (m, 4H); ESI MS m/z 497 [M+H]+.

Example 47 Preparation of (4-(3,4-difluoro-2(trifluoromethyl)phenyl)piperidin-1-yl)(5-(2-methoxyethyl)-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(109)

Step A: Following general procedure GP-J2,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and 2-methoxy-bromoethane were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(2-methoxyethyl)-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone as a white solid (14 mg, 22%): No clear melt observed; 1H NMR(300 MHz, DMSO-d₆) δ 13.070-12.860 (m, 1H), 7.852-7.648 (m, 1H),7.616-7.449 (m, 1H), 5.365-3.596 (m, 6H), 3.560-3.413 (m, 2H),3.298-3.219 (m, 4H), 3.219-3.047 (m, 2H), 2.937-2.832 (m, 3H),1.843-1.576 (m, 5H); ESI MS m/z 459.2 [M+H]+.

Example 48 Preparation of3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,6-dihydropyrrolo[3,4-c]pyrazole-5(1H)-carbonitrile(110)

Step A: Following general procedure GP-J2,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and cyanogen bromide were converted to-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,6-dihydropyrrolo[3,4-c]pyrazole-5(1H)-carbonitrileas a white solid (23 mg, 79%): No clear melt observed; ¹H NMR (500 MHz,DMSO-d₆) δ 13.623-13.172 (m, 1H), 7.850-7.664 (m, 1H), 7.664-7.470 (m,1H), 5.552-3.846 (m, 6H), 3.271-2.652 (m, 3H), 2.042-1.503 (m, 4H); ESIMS m/z 426 [M+H]+.

Example 49 Preparation of(4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(6-ethyl-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanone(111)

Step A: Following general procedure GP-G1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneTFA salt (34) and acetaldehyde were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(6-ethyl-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneas a white solid (13 mg, 21%): mp 207-210° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 12.90 (br s, 0.25H), 12.71 (br s, 0.75H), 7.78-7.70 (m, 1H), 7.50-7.49(m, 1H), 4.87-4.85 (m, 1H), 4.68-4.66 (m, 1H), 3.48-3.45 (m, 2H),3.14-3.13 (m, 2H), 2.78-2.77 (m, 1H), 2.61-2.55 (m, 6H, partially mergedwith DMSO peak), 1.76-1.70 (m, 4H), 1.07 (t, J=7.0 Hz, 3H); ESI MS m/z443 [M+H]+.

Example 50 Preparation of3-(4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-N-methyl-1,4,5,7-tetrahydro-6Hpyrazolo[3,4-c]pyridine-6-carboxamide(112)

Step A: Following general procedure GP-E2,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneTFA salt (34) and isocyanatomethane were converted to3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-N-methyl-1,4,5,7-tetrahydro-6Hpyrazolo[3,4-c]pyridine-6-carboxamideas an off-white solid (6 mg, 27%): mp 220-225° C.; ¹H NMR (500 MHz,DMSO-d₆) δ 13.05 (br s, 0.25H), 12.85 (br s, 0.75H), 7.79-7.70 (m, 1H),7.51-7.48 (m, 1H), 6.61-6.60 (m, 0.75H), 6.55-6.54 (m, 0.25H), 4.86-4.84(m, 1H), 4.68-4.65 (m, 1H), 4.47-4.42 (m, 2H), 3.54-3.50 (m, 2H),3.14-3.13 (m, 2H), 2.78-2.77 (m, 1H), 2.59-2.56 (m, 5H, partially mergedwith DMSO peak), 1.76-1.67 (m, 4H); ESI MS m/z 472 [M+H]+.

Example 51 Preparation of(4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(6-methyl-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanone(113)

Step A: Following general procedure GP-G1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneTFA salt (34) and formaldehyde were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(6-methyl-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneas a white solid (18 mg, 55%): mp 210-211° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 12.91 (br s, 0.25H), 12.72 (br s, 0.75H), 7.79-7.70 (m, 1H), 7.50-7.49(m, 1H), 4.88-4.86 (m, 1H), 4.67-4.65 (m, 1H), 3.43-3.40 (m, 2H),3.15-3.13 (m, 2H), 2.77-2.76 (m, 1H), 2.65-2.60 (m, 4H), 2.36 (s, 3H),1.76-1.69 (m, 4H); ESI MS m/z 429 [M+H]+.

Example 52 Preparation of 3-(4-(3-Fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-N-methyl-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4)-carboxamide(114)

Step A: Following general procedure GP-C,(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (32) and methyl isocyanate were converted to3-(4-(3-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-N-methyl-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxamideas a white solid (32 mg, 41%): mp 165-170° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 13.03-12.85 (m, 1H), 7.70-7.62 (m, 1H), 7.46 (d, J=8.0 Hz, 1H), 7.30(dd, J=12.0, 8.0 Hz, 1H), 6.58-6.49 (m, 1H), 5.19-5.06 (m, 2H),4.76-4.62 (m, 2H), 3.63-3.50 (m, 2H), 3.27-3.09 (m, 2H), 2.86-2.72 (m,1H), 2.64 (t, J=5.5 Hz; 2H), 2.59-2.54 (m, 3H), 1.84-1.59 (m, 4H); ESIMS m/z 454 [M+H].

Example 53 Preparation of2-(3-(4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-1,4,5,7-tetrahydro-6H-pyrazolo[3,4-c]pyridin-6-yl)aceticacid (115)

Step A: Following general procedure GP-G2,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneTFA salt (34) and tert-butyl 2-bromoacetate were converted to providetert-butyl2-(3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-1,4,5,7-tetrahydro-6H-pyrazolo[3,4-c]pyridin-6-yl)acetateas a clear, glassy solid (55 mg, 69%): ¹H NMR (500 MHz, DMSO-d₆) δ 12.94(br s, 0.25H), 12.71 (br s, 0.75H), 7.37-7.33 (m, 1H), 7.50-7.49 (m,1H), 4.86-4.84 (m, 1H), 4.68-4.66 (m, 1H), 3.67-3.63 (m, 2H), 3.34-3.30(m, 2H, partially merged with H₂O peak), 3.14-3.13 (m, 2H), 2.59-2.58(m, 3H), 2.59-2.50 (m, 2H, partially merged with DMSO peak), 1.76-1.70(m, 4H), 1.43 (s, 9H); ESI MS m/z 529 [M+H]+.

Step B: A solution tert-butyl2-(3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-1,4,5,7-tetrahydro-6H-pyrazolo[3,4-c]pyridin-6-yl)acetate(53 mg, 0.10 mmol) in anhydrous CH₂C₁₂ (3 mL) was treated with TFA (3mL) and stirred under an atmosphere of N₂ at room temperature for 8 h.After this time, the mixture was concentrated to dryness under reducedpressure and solvent exchanged with CH₂Cl₂ (10 mL). The residue wasdiluted in anhydrous CH₂Cl₂ (10 mL), treated with MP-carbonate (0.50 g)and stirred at room temperature for 15 min. After this time, thesolution was filtered and the resin washed with CH₂C₁ (2×10 mL). Thefiltrate was concentrated to dryness under reduced pressure to provide2-(3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-1,4,5,7-tetrahydro-6H-pyrazolo[3,4-c]pyridin-6-yl)aceticacid as an off-white solid (40 mg, 85%): mp 151-153° C.; ¹H NMR (500MHz, DMSO-d₆) δ 13.29 (br s, 0.25H), 12.89 (br s, 0.75H), 7.56-7.55 (m,1H), 7.51-7.50 (m, 1H), 4.87-4.86 (m, 1H), 4.66-4.64 (m, 1H), 4.04-4.02(m, 2H), 3.76-3.72 (m, 2H), 3.34-3.32 (m, 2H, partially merged with H₂Opeak), 3.15-3.11 (m, 4H), 2.76-2.74 (m, 2H), 1.76-1.70 (m; 4H); ESI MSm/z 473 [M+H]+.

Example 54 Preparation of Methyl3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-1,4,5,7-tetrahydro-6H-pyrazolo[3,4-c]pyridine-6-carboxylate(116)

Step A: Following general procedure GP-E1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneTFA salt (34) and methyl carbonochloridate were converted to3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-1,4,5,7-tetrahydro-6Hpyrazolo[3,4-c]pyridine-6-carboxylateas a light orange solid (30 mg, 60%): mp 238-240° C.; ¹H NMR (500 MHz,DMSO-d₆) δ 13.13 (br s, 0.25H), 12.86 (br s, 0.75H), 7.78-7.70 (m, 1H),7.51-7.48 (m, 1H), 4.82-4.80 (m, 1H), 4.67-4.65 (m, 1H), 4.54 (s, 1.5H),4.50 (s, 0.5H), 3.64 (s, 3H), 3.60-3.57 (m, 2H), 3.15-3.13 (m, 2H),2.79-2.78 (m, 1H), 2.64-2.59 (m, 2H), 1.76-1.68 (m, 4H); ESI MS m/z 473[M+H]+.

Example 55 Preparation of(4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(6-(oxetan-3-yl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanone(117)

Step A: Following general procedure GP-G1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneTFA salt (34) and oxetan-3-one were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(6-(oxetan-3-yl)-4,5,6,7-tetrahydro-1Hpyrazolo[3,4-c]pyridin-3-yl)methanoneas an off-white solid (32 mg, 50%): mp 206-207° C.; ¹H NMR (500 MHz,DMSO-d₆) δ 12.96 (br s, 0.25H), 12.76 (br s, 0.75H), 7.80-7.70 (m, 1H),7.51-7.50 (m, 1H), 4.86-4.84 (m, 1H), 4.68-4.65 (m, 1H), 4.60 (apparentt, J=6.5 Hz, 2H), 4.50 (apparent t, J=6.0 Hz, 2H), 3.71-3.64 (m, 1H),3.43-3.38 (m, 2H), 3.15-3.13 (m, 2H), 2.78-2.77 (m, 1H), 2.64-2.60 (m,2H), 1.79-1.68 (m, 4H), CH₂ obscured by solvent peak; ESI MS m/z 471[M+H]+.

Example 56 Preparation of(6-(Cyclopropylmethyl)-4,5,6,7-tetrahydro-1Hpyrazolo[3,4-c]pyridin-3-yl)(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanone(118)

Step A: Following general procedure GP-G1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneTFA salt (34) and cyclopropanecarbaldehyde were converted to(6-(cyclopropylmethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanoneas a white solid (30 mg, 58%): mp 184-185° C.; ¹H NMR (500 MHz, CD₃OD) δ7.53 (dd, J=17.5, 9.0 Hz, 1H), 7.39 (dd, J=9.0, 4.0 Hz, 1H), 4.83-4.82(m, 1H, partially merged with H₂O peak), 4.65-4.63 (m, 1H), 3.94-3.92(m, 2H), 3.29-3.26 (m, 2H, partially merged with CH₃₀H peak), 3.05-3.03(m, 2H), 2.90-2.84 (m, 3H), 2.69-2.67 (m, 2H), 1.89-1.81 (m, 4H),1.04-1.02 (m, 1H), 0.65 (d, J=7.0 Hz, 2H), 0.29-0.27 (m, 2H), NH protonnot observed; ESI MS m/z 469 [M+H]+.

Example 57 Preparation of (4-(3,4-Difluoro-2(trifluoromethyl)phenyl)piperidin-1-yl)(6-(3,3,3-trifluoropropyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanone(119)

Step A: Following general procedure GP-G1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneTFA salt (34) and 3,3,3-trifluoropropanal were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(6-(3,3,3-trifluoropropyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneas an off-white solid (18 mg, 36%): mp 194-195° C.; ¹H NMR (500 MHz,DMSO-d₆) δ 12.94 (br s, 0.25H), 12.76 (br s, 0.75H), 7.79-7.70 (m, 1H),7.50-7.49 (m, 1H), 4.87-4.85 (m, 1H), 4.68-4.66 (m, 1H), 3.57-3.53 (m,2H), 3.15-3.13 (m, 2H), 2.75 (t, J=7.5 Hz, 2H), 2.69-2.67 (m, 2H),2.58-2.50 (m, 5H, partially merged with DMSO peak), 1.76-1.68 (m, 4H);ESI MS m/z 511 [M+H]+.

Example 58 Preparation of3-(4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-1,4,5,7-tetrahydro-6H-pyrazolo[3,4-c]pyridine-6-carbonitrile(120)

Step A: Following general procedure GP-G2,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneTFA salt (34) and cyanogen bromide were converted to3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-1,4,5,7-tetrahydro-6H-pyrazolo[3,4-c]pyridine-6-carbonitrileas a white solid (36 mg, 83%): mp 248-250° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 13.26 (br s, 0.25H), 12.97 (br s, 0.75H), 7.78-7.75 (m, 1H), 7.51-7.49(m, 1H), 4.85 (apparent d, J=8.0 Hz, 1H), 4.68-4.66 (m, 1H), 4.47-4.40(m, 2H), 3.43-3.40 (m, 2H), 3.16-3.14 (m, 2H), 2.77-2.72 (m, 3H),1.77-1.71 (m, 4H); ESI MS m/z 440 [M+H]+.

Example 59 Preparation of1-(3-(4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-1,4,5,7-tetrahydro-6H-pyrazolo[3,4-c]pyridin-6-yl)-2-methylpropan-1-one(121)

Step A: Following general procedure GP-E1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneTFA salt (34) and isobutyryl chloride were converted to1-(3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-1,4,5,7-tetrahydro-6Hpyrazolo[3,4-c]pyridin-6-yl)-2-methylpropan-1-oneas a white solid (29 mg, 62%): mp 228-229° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 13.12 (br s, 0.25H), 12.87 (br s, 0.75H), 7.79-7.70 (m, 1H), 7.50-7.48(m, 1H), 4.88-4.86 (m, 1H), 4.68-4.56 (m, 3H), 3.70 (s, 2H), 3.15-3.13(m, 2H), 2.99-2.97 (m, 1H), 2.79-2.77 (m, 1H), 2.70-2.64 (m, 2H),1.76-1.68 (m, 4H), 1.04-1.01 (m, 6H); ESI MS m/z 485 [M+H]+.

Example 60 Preparation of1-(3-(4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-1,4,5,7-tetrahydro-6H-pyrazolo[3,4-c]pyridin-6-yl)propan-1-one(122)

Step A: Following general procedure GP-E1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneTFA salt (34) and propionyl chloride were converted tol-(3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-1,4,5,7-tetrahydro-6Hpyrazolo[3,4-c]pyridin-6-yl)propan-1-oneas a white solid (35 mg, 63%): mp 182-187° C.; ¹H NMR (500 MHz, DMSO-d₆)δ13.15-13.10 (m, 0.25H), 12.87 (br s, 0.75H), 7.76-7.72 (m, 1H),7.51-7.49 (m, 1H), 4.85-4.83 (m, 1H), 4.68-4.57 (m, 3H), 3.69 (s, 0.5H),3.63 (s, 1.5H), 3.15-3.13 (m, 2H), 2.79-2.77 (m, 1H), 2.68-2.55 (m, 2H,partially merged with DMSO peak), 2.46-2.38 (m, 2H), 1.76-1.71 (m, 4H),1.02 (t, J=7.5 Hz, 3H); ESI MS m/z 471 [M+H]+.

Example 61 Preparation of1-(3-(4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-1,4,5,7-tetrahydro-6H-pyrazolo[3,4-c]pyridin-6-yl)-3-methylbutan-1-one(123)

Step A: Following general procedure GP-E1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneTFA salt (34) and 3-methylbutanoyl chloride were converted tol-(3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-1,4,5,7-tetrahydro-6Hpyrazolo[3,4-c]pyridin-6-yl)-3-methylbutan-1-oneas a white solid (37 mg, 63%): mp 184-188° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 13.13-13.11 (m, 0.25H), 12.87-12.84 (m, 0.75H), 7.79-7.70 (m, 1H),7.51-7.49 (m, 1H), 4.89-4.86 (m, 1H), 4.67-4.57 (m, 3H), 3.67-3.64 (m,2H), 3.15-3.13 (m, 2H), 2.79-2.77 (m, 1H), 2.68-2.64 (m, 2H), 2.55-2.51(m, 1H, partially merged with DMSO peak), 2.02 (pent, J=7.0 Hz, 1H),1.76-1.70 (m, 4H), 1.26 (t, J=7.0 Hz, 1H), 0.92-0.90 (m, 6H); ESI MS m/z499 [M+H]+.

Example 62 Preparation of(4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(6-(2-methoxyethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanone(124)

Step A: Following general procedure GP-G2,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneTFA salt (34) and 1-bromo-2-methoxyethane were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(6-(2-methoxyethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneas a white solid (33 mg, 48%): mp 171-173° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 12.91 (br s, 0.25H), 12.71 (br s, 0.75H), 7.78-7.70 (m, 1H), 7.51-7.48(m, 1H), 4.85 (apparent d, J=11.0 Hz, 1H), 4.66 (apparent d, J=11.0 Hz,1H), 3.57-3.49 (m, 4H), 3.25 (s, 3H), 3.16-3.11 (m, 2H), 2.77-2.58 (m,7H), 1.76-1.68 (m, 4H); ESI MS m/z 473 [M+H]+.

Example 63 Preparation of(4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(6-(2,2,2-trifluoroethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanone(125)

Step A: Following general procedure GP-G2,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneTFA salt (34) and 2,2,2-trifluoroethyl trifluoromethanesulfonate wereconverted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(6-(2,2,2-trifluoroethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanone as an offwhite solid (39 mg, 72%): mp 192-193° C.; ¹H NMR (500MHz, DMSO-d₆) δ 13.00 (br s, 0.25H), 12.76 (br s, 0.75H), 7.80-7.70 (m,1H), 7.50-7.48 (m, 1H), 4.85 (apparent d, J=11.0 Hz, 1H), 4.66 (apparentd, J=11.0 Hz, 1H), 3.79 (s, 1.5H), 3.75 (s, 0.5H), 3.42-3.35 (m, 2H),3.15-3.13 (m, 2H), 2.87 (t, J=6.0 Hz, 2H), 2.78-2.76 (m, 1H), 2.64-2.62(m, 2H), 1.79-1.68 (m, 4H); ESI MS m/z 497 [M+H]+.

Example 64 Preparation of (4-(3,4-Difluoro-2(trifluoromethyl)phenyl)piperidin-1-yl)(6-neopentyl-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanone(126)

Step A: Following general procedure GP-G1,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneTFA salt (34) and pivalaldehyde were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(6-neopentyl-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanoneas a white solid (28 mg, 49%): mp 218-220° C.; ¹H NMR (500 MHz, DMSO-d₆)δ12.90 (br s, 0.25H), 12.67 (br s, 0.75H), 7.75-7.70 (m, 1H), 7.49 (dd,J=8.0, 4.0 Hz, 1H), 4.88 (apparent d, J=12.0 Hz, 1H), 4.67 (apparent d,J=10.0 Hz, 1H), 3.61 (s, 1.5H), 3.59 (s, 0.5H), 3.15-3.13 (m, 2H),2.78-2.76 (m, 1H), 2.71 (t, J=5.5 Hz, 2H), 2.64-2.58 (m, 2H), 2.25 (s,2H), 1.79-1.68 (m, 4H), 0.88 (s, 9H); ESI MS m/z 485 [M+H]+.

Example 65 Preparation of(4-(3,5-Difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(2-methoxyethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(127)

Step A: Following general procedure GP-G2,(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanone hydrochloride (60) and bromoethylmethyl ether were convertedto(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(2-methoxyethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneas a white solid (32 mg, 41%): H NMR (500 MHz, DMSO-d₆) δ 12.85 (m, 1H),7.48 (m, 2H), 5.12 (m, 1H), 4.67 (m, 1H), 3.50 (m, 4H), 3.01-3.32 (m,5H), 2.73 (m, 7H), 3.63-3.50 (m, 2H), 1.62 (m, 4H); ESI MS m/z 473[M+H]⁺.

Example 66 Preparation of(4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(piperidine-1-carbonyl)-1,4,5,6tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone (128)

Step A: Following general procedure GP-H2,(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(38) and piperidine-1-carbonyl chloride were converted to(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(piperidine-1-carbonyl)-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanoneas a white solid (45 mg, 77%): mp 236-237° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 13.26 (br s, 0.6H), 13.06 (br s, 0.4H), 7.79-7.70 (m, 1H), 7.56-7.50(m, 1H), 5.25-5.23 (m, 0.4H), 4.65-4.62 (m, 0.6H), 4.57 (s, 2H), 4.47(s, 2H), 4.17-3.91 (m, 1H), 3.26-3.03 (m, 6H), 3.01-2.73 (m, 1H),1.80-1.71 (m, 4H), 1.53-1.49 (m, 6H); ESI MS m/z 512 [M+H]+.

Example 67 Preparation of(4-(3,5-Difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(3,3,3-trifluoropropyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(129)

Step A: Following general procedure GP-G2,(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (60) and 3-bromo-1,1,1-trifluoropropane were converted to(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(2-methoxyethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneas a white solid (41 mg, 51%): ¹H NMR (500 MHz, DMSO-d₆) δ 12.83 (m,1H), 7.43 (m, 2H), 5.12 (m, 1H), 4.67 (m, 1H), 3.53 (m, 2H), 2.50-3.12(m, 11H), 1.68 (m, 4H); ESI MS m/z 511 [M+H].

Example 68 Preparation of Methyl3-(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-1,4,5,7-tetrahydro-6H-pyrazolo[3,4-c]pyridine-6-carboxylate(130)

Step A: Following general procedure GP-E2,(4-(3,5-bis(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (52) and methyl carbonochloridate were converted to methyl3-(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-1,4,5,7-tetrahydro-6H-pyrazolo[3,4-c]pyridine-6-carboxylateas an off-white solid (7 mg, 20%): mp 253-254° C.; ¹H NMR (500 MHz,DMSO-d₆) δ 13.12 (br s, 0.25H), 12.86 (br s, 0.75H), 7.45-7.38 (m, 2H),4.84-4.82 (m, 1H), 4.68-4.66 (m, 1H), 4.54-4.51 (m, 2H), 3.64 (s, 3H),3.60-3.58 (m, 2H), 3.20-3.13 (m, 2H), 2.79-2.77 (m, 1H), 2.65-2.62 (m,2H), 1.76-1.72 (m, 4H); ESI MS m/z 473 [M+H]+.

Example 69 1-(3-(4-(3,5-Difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridin-6(7H)-yl)ethanone(131)

Step A: Following general procedure GP-E1,(4-(3,5-bis(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (52) and acetyl chloride were converted to1-(3-(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridin-6(7H)-yl)ethanoneas a white solid (0.087 g, 41%): ¹H NMR (300 MHz, CDCl₃) δ11.01 (br,1H), 6.93 (m, 1H), 6.78 (m, 1H), 4.84-4.66 (m, 4H), 3.85-3.67 (m, 2H),3.34-2.68 (m, 5H), 2.22 and 2.19 (s, 3H), 1.89-1.66 (m, 4H); MS (ESI+)m/z 457 [M+H]+. 77 (m, 1H), 2.65-2.62 (m, 2H), 1.76-1.72 (m, 4H); ESI MSm/z 473 [M+H]+.

Example 703-(4-(3,5-Difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-[1,2,4]triazolo[4,3-a]pyridine-6-carbonitrile(132)

Step A: To a solution of tert-butyl4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carboxylate(0.246 g, 0.675 mmol) in dichloromethane (5 mL) was added HCl (2 M inether, 10 mL). The mixture was stirred for 6 h and evaporated to afforda solid that was dissolved in DMF (4 mL). In a separate flask, to asolution of ethyl 6-bromo-[1,2,4]triazolo[4,3-a]pyridine-3-carboxylate(0.182 g, 0.675 mmol) in THF (5 mL) was added a solution of lithiumhydroxide hydrate (0.028 g, 0.675 mmol) in water (2 mL). The mixture wasstirred for 20 min, acidified with 2 N HCl to pH 6 and evaporated todryness. To this residue were addedbenzotriazole-1-yl-oxytris(dimethylamino)phosphonium hexafluorophosphate(0.448 g, 1.01 mmol), N,N-diisopropylethylamine (0.349 g, 2.70 mmol),and the DMF solution obtained from the first reaction. The mixture wasstirred at ambient temperature for 16 h and poured into water. Themixture was extracted with ethyl acetate and the organic layer waswashed with brine for three times, dried (Na₂SO₄), filtered, andconcentrated under reduced pressure. The resulting residue waschromatographed over silica gel (0-60% EtOAc in hexanes) to give(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanoneas an off-white solid (0.115 g, 34%): ¹H NMR (300 MHz, CDCl₃) 89.37 (m,1H), 7.79 (dd, J=9.6, 0.9 Hz, 1H), 7.50 (dd, J=9.6, 1.7 Hz, 1H), 6.96(d, J=9.7 Hz, 1H), 6.84-6.77 (m, 1H), 5.77-5.72 (m, 1H), 5.00-4.95 (m,1H), 3.44-3.29 (m, 2H), 3.01-2.92 (m, 1H), 2.01-1.69 (m, 4H); MS (ESI+)m/z 489 [M+H]+.

Step B: A mixture of(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanone (0.115 g, 0.235 mmol), zinc cyanide (0.055 g, 0.470 mmol),tetrakis(triphenylphosphine)palladium (0.027 g, 0.0235 mmol), and DMF (4mL) was heated under microwave irradiation at 130° C. for 30 min. Aftercooling to ambient temperature, the mixture was diluted with water (80mL) and extracted with EtOAc (80 mL). The extract was washed with brine(2×80 mL), dried (Na₂SO₄), filtered, and concentrated under reducedpressure. The resulting residue was chromatographed over silica gel(0-50% EtOAc in hexanes) to give3-(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-[1,2,4]triazolo[4,3-a]pyridine-6-carbonitrileas a white solid (0.050 g, 49%): ¹H NMR (300 MHz, CDCl₃) δ9.71 (m, 1H),7.98 (dd, J=9.5, 1.0 Hz, 1H), 7.51 (dd, J=9.5, 1.6 Hz, 1H), 6.95 (d,J=9.5 Hz, 1H), 6.84-6.77 (m, 1H), 5.76 (m, 1H), 5.01-4.96 (m, 1H),3.46-3.31 (m, 2H), 3.03-2.94 (m, 1H), 2.07-1.70 (m, 4H); MS (ESI+) m/z436 [M+H]+.

Example 71 Preparation of(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-ethyl-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(133)

Step A: Following general procedure GP-G1,(4-(3,5-bis(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (52) and acetaldehyde were converted to(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-ethyl-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneas a white solid (29 mg, 67%): mp 149-155° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 12.766 (s, 1H), 7.481-7.353 (m, 1H), 5.196-5.049 (m, 1H), 4.765-4.569(m, 1H), 3.558-3.378 (m, 2H), 3.263-3.048 (m, 2H), 2.850-2.715 (m, 1H),2.664 (s, 4H), 2.575-2.515 (m, 2H), 1.858-1.606 (br s, 4H), 1.121-1.018(m, 4H); ESI MS m/z 443.2 [M+H]+.

Example 72 Preparation of(5-(cyclopropylmethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanone(134)

Step A: Following general procedure GP-G1,(4-(3,5-bis(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (52) and cyclopropyl acetaldehyde were converted to(5-(cyclopropylmethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanoneas a white solid (29 mg, 67%): No clear melt observed; ¹H NMR (500 MHz,DMSO-d₆) δ 12.764 (s, 1H), 7.522-7.347 (m, 2H), 5.225-5.016 (br s, 1H),4.766-4.580 (br s, 1H), 3.673-3.444 (m, 2H), 3.258-3.034 (m, 2H),2.868-2.601 (m, 5H), 2.443-2.334 (m, 2H), 1.858-1.620 (br s, 4H),0.995-0.829 (m, 1H), 0.551-0.410 (m, 2H), 0.195-0.075 (m, 2H); ESI MSm/z 469.1 [M+H]+.

Example 73 Preparation of(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(oxetan-3-yl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(135)

Step A: Following general procedure GP-G1,(4-(3,5-bis(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (52) and 3-oxetanone were converted to(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(oxetan-3-yl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneas a white solid (35 mg, 67%): No clear melt observed; ¹H NMR (300 MHz,DMSO-d₆) δ 12.843 (s, 1H), 7.483-7.346 (m, 1H), 5.234-5.065 (br s, 1H),4.731-4.627 (br s, 1H), 4.627-4.562 (m, 2H), 4.562-4.452 (m, 2H),3.714-3.643 (m, 1H), 3.473-3.337 (br s, 2H), 3.260-3.058 (m, 2H),2.850-2.724 (m, 1H), 2.724-2.658 (m, 2H), 2.582-2.516 (m, 2H),1.876-1.586 (br s, 4H); ESI MS m/z 471 [M+H]+.

Example 74 Preparation of3-(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carbonitrile(136)

Step A: Following general procedure GP-G2,(4-(3,5-bis(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (52) and cyanogen bromide were converted to3-(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carbonitrileas a white solid (16 mg, 55%): No clear melt observed; ¹H NMR (500 MHz,DMSO-d₆) δ 13.146-13.060 (m, 1H), 7.508-7.356 (m, 2H), 5.402-4.584 (m,2H), 4.433-4.327 (m, 2H), 3.536-3.412 (m, 2H), 3.261-3.092 (m, 2H),2.905-2.728 (m, 3H), 1.884-1.608 (m, 4H); ESI MS m/z 440 [M+H]+.

Example 75 Preparation of(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(2,2,2-trifluoroethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(137)

Step A: Following general procedure GP-G2, (4-(3,5-bis(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (52) and 2,2,2-trifluoroethyl trifluoromethanesulfonatewere converted to(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(2,2,2-trifluoroethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone as a white solid (16 mg, 55%): No clear melt observed; 1H NMR(500 MHz, DMSO-d₆) δ 13.033-12.768 (m, 1H), 7.506-7.333 (m, 2H),5.290-4.578 (m, 2H), 3.894-3.657 (m, 2H), 3.447-3.320 (m, 2H),3.256-3.037 (m, 2H), 2.937 (s, 2H), 2.709 (s, 3H), 1.906-1.605 (br s,4H); ESI MS m/z 497 [M+H]+.

Example 76 Preparation of Methyl3-(4-(3,5-difluoro-2-(trifluoro-methyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylate(138)

Step A: Following general procedure GP-B2,(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (60) and methyl chloroformate were converted to methyl3-(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylateas a white solid (16 mg, 55%): ¹H NMR (300 MHz, DMSO-d₆) δ 13.11-12.93(m, 1H), 7.56-7.32 (m, 2H), 5.40-5.16 (m, 1H), 4.81-4.59 (m, 1H),4.59-4.40 (m, 2H), 3.64 (s, 5H), 3.28-3.03 (br s, 2H), 2.89-2.62 (m,3H), 1.94-1.61 (br s, 4H); ESI MS m/z 472 [M+H]⁺.

Example 77 Preparation of3-(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-N-methyl-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxamide(139)

Step A: Following general procedure GP-E2,(4-(3,5-bis(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (52) and methyl isocyanate were converted to3-(4-(3,5-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-N-methyl-6,7-dihydro-1Hpyrazolo[4,3-c]pyridine-5(4H)-carboxamideas a white solid (16 mg, 55%): No clearmelt; ¹H NMR (500 MHz, DMSO-d₆) δ13.043-12.777 (m, 1H), 7.523-7.348 (m, 2H), 6.536 (s, 1H), 5.275-4.595(m, 2H), 4.536-4.296 (m, 2H), 3.561 (s, 2H), 3.273-3.076 (m, 2H),2.891-2.706 (br s, 1H), 2.706-2.614 (m, 2H), 2.576 (s, 3H), 1.906-1.585(m, 4H); ESI MS m/z 472 [M+H]+.

Example 78 Preparation of1-(3-(4-(5-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridin-6(7H)-yl)ethanone(140)

Step A: Following general procedure GP-E1,(4-(5-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (44) and acetyl chloride were converted to1-(3-(4-(5-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-yl)ethanoneas a white solid (27 mg, 41%): mp 190-195° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 13.17-12.85 (m, 1H), 7.79-7.73 (m, 1H), 7.57-7.52 (m, 1H), 7.30-7.22(m, 1H), 4.94-4.77 (m, 1H), 4.74-4.63 (m, 1H), 4.62-4.51 (m, 2H),3.73-3.56 (m, 2H), 3.19-3.06 (m, 2H), 2.83-2.53 (m, 3H), 2.14-2.05 (m,3H), 1.80-1.64 (m, 4H); ESI MS m/z 439 [M+H]+.

Example 79 Preparation of (4-(5-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(methylsulfonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(141)

Step A: Following general procedure GP-C,(4-(5-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (46) and methane sulfonyl chloride were converted to(4-(5-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(methylsulfonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneas a white solid (105 mg, 60%): mp>260° C.; ¹H NMR (500 MHz, DMSO-d₆) δ13.03 (s, 1H), 7.76 (dd, J=9.0, 6.0 Hz, 1H), 7.55 (dd, J=10.5, 2.5 Hz,1H), 7.28-7.21 (m, 1H), 5.34-5.23 (m, 1H), 4.72-4.64 (m, 1H), 4.43-4.26(m, 2H), 3.54-3.39 (m, 2H), 3.22-3.09 (m, 2H), 2.94 (s, 3H), 2.86-2.72(m, 3H), 1.83-1.67 (m, 4H); ESI MS m/z 475 [M+H]+.

Example 80 Preparation of3-(4-(5-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-[1,2,4]triazolo[4,3-a]pyridine-6-carbonitrile(142)

Step A: To a solution of ethyl6-bromo-[1,2,4]triazolo[4,3-a]pyridine-3-carboxylate (85 mg, 0.32 mmol)in THF (2.6 mL) was added a solution of LiOH monohydrate (15 mg, 0.35mmol) in H₂O (1.8 mL). The mixture stirred for 20 min and wasneutralized with 2 N HCl. The mixture was concentrated under reducedpressure. The obtained residue was diluted in DMF (3.0 mL) under anatmosphere of N2. To this mixture was added4-(5-fluoro-2-trifluoromethyl)phenylpiperidine hydrochloride (11, 89 mg,0.32 mmol), benzotriazole-1-yl-oxy-tris-(dimethylamino)-phosphoniumhexafluorophosphate (280 mg, 0.63 mmol), and diisopropylethylamine (0.17mL, 0.95 mmol). The mixture was stirred at ambient temperature for 18 h.The resulting mixture was diluted with H₂O (20 mL). The solution wasextracted with EtOAc (3×20 mL). The combined organic layers were washedwith a saturated brine solution (3×20 mL) and concentrated under reducedpressure. The resulting residue was chromatographed over silica gel(Isco CombiFlash Rf unit, 12 g Redisep column, 0% to 50% EtOAc inhexanes) to provide to provide(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(5-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanoneas a white solid (97 mg, 65%): ¹H NMR (500 MHz, DMSO-d₆) δ 9.16-9.14 (m,1H), 7.98 (dd, J=10.0, 1.0 Hz, 1H), 7.77 (dd, J=8.5, 5.5 Hz, 1H), 7.72(dd, J=9.5, 1.5 Hz, 1H), 7.52 (dd, J=11.0, 3.5 Hz, 1H), 7.29-7.23 (m,1H), 5.31-5.24 (m, 1H), 4.76-4.70 (m, 1H), 3.42-3.32 (m, 1H), 3.27-3.19(m, 1H), 3.06-2.96 (m, 1H), 1.98-1.75 (m, 4H).

Step B: A solution of(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(5-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanone(97 mg, 0.21 mmol) in DMF (2.2 mL) was sparged with Ar for 20 min. Zinccyanide (48 mg, 0.41 mmol) was added and the solution sparged with Arfor 10 min. To the solution was added Pd(PPh₃)₄ (24 mg, 0.021 mmol) andthe vessel was sealed and heated to 130° C. with microwaves for 30 min.The mixture was diluted with saturated sodium bicarbonate solution (10mL) and extracted with EtOAc (4×30 mL). The combined organic extractswere concentrated to dryness under reduced pressure. The resultingresidue was chromatographed over silica gel (Isco CombiFlash Rf unit, 12g Redisep column, 0% to 50% EtOAc in hexanes) and freeze dried to give3-(4-(5-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-[1,2,4]triazolo[4,3-a]pyridine-6-carbonitrileas a white solid (35 mg, 41%): mp 190-197° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 9.54-9.53 (m, 1H), 8.14 (dd, J=9.5, 1.5 Hz, 1H), 7.82 (d, J=9.5, 1.5Hz, 1H), 7.78 (dd, J=9.0, 6.0 Hz, 1H), 7.56 (dd, J=10.5, 2.5 Hz, 1H),7.30-7.24 (m, 1H), 5.20-5.10 (m, 1H), 4.73-4.71 (m, 1H), 3.43-3.34 (m,1H), 3.29-3.20 (m, 1H), 3.08-3.00 (m, 1H), 1.99-1.77 (m, 4H); ESI MS m/z418 [M+H]+.

Example 81 Preparation of 1-(3-(4-(2-chloro-5-fluorophenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridin-6(7H)-yl)ethanone(143)

Step A: Following general procedure GP-E1,((4-(2-chloro-5-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (48) and acetyl chloride were converted to1-(3-(4-(2-chloro-5-fluorophenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridin-6(7H)-yl)ethanoneas a white solid (27 mg, 63%): ¹H NMR (500 MHz, DMSO-d₆) δ 13.99-12.18(m, 1H), 7.48 (dd, J=9.0, 5.5 Hz, 1H), 7.72 (dd, J=10.5, 3.5 Hz, 1H),7.15-7.08 (m, 1H), 4.90-4.74 (m, 1H), 4.73-4.53 (m, 3H), 3.71-3.55 (m,2H), 3.28-3.10 (m, 2H), 2.87-2.50 (m, 3H, overlaps with solvent),2.12-2.04 (m, 3H), 1.91-1.71 (m, 2H), 1.66-1.52 (m, 2H); ESI MS m/z 405[M+H]+.

Example 82 Preparation of(4-(2-chloro-5-fluorophenyl)piperidin-1-yl)(5-(methylsulfonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(144)

Step A: Following general procedure GP-C,(4-(2-chloro-5-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (50) and methane sulfonyl chloride were converted to(4-(2-chloro-5-fluorophenyl)piperidin-1-yl)(5-(methylsulfonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneas a white solid (36 mg, 51%): mp 260-267° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 13.03 (s, 1H), 7.48 (dd, J=8.5, 5.0 Hz, 1H), 7.28 (dd, J=10.5, 3.5 Hz,1H), 7.13-7.08 (m, 1H), 5.30-5.20 (m, 1H), 4.72-4.63 (m, 1H), 4.41-4.24(m, 2H), 3.53-3.40 (m, 2H), 3.28-3.13 (m, 2H), 2.93 (s, 3H), 2.89-2.73(m, 3H), 1.90-1.74 (m, 2H), 1.70-1.51 (m, 2H); ESI MS m/z 441 [M+H]+.

Example 83 Preparation of3-(4-(2-Chloro-5-fluorophenyl)piperidine-1-carbonyl)-[1,2,4]triazolo[4,3-a]pyridine-6-carbonitrile(145)

Step A: To a solution of ethyl6-bromo-[1,2,4]triazolo[4,3-a]pyridine-3-carboxylate (73 mg, 0.27 mmol)in THF (2.2 mL) was added a solution of LiOH monohydrate (13 mg, 0.30mmol) in H₂O (1.5 mL). The mixture stirred for 20 min and wasneutralized with 2 N HCl. The mixture was concentrated under reducedpressure. The obtained residue was diluted in DMF (2.9 mL) under anatmosphere of N2. To this mixture was added4-(2-chloro-5-fluorophenyl)piperidine hydrochloride (17, 68 mg, 0.27mmol), benzotriazole-1-yl-oxy-tris-(dimethylamino)-phosphoniumhexafluorophosphate (240 mg, 0.54 mmol), and diisopropylethylamine (0.14mL, 0.81 mmol). The mixture was stirred at ambient temperature for 18 h.The resulting mixture was diluted with H₂O (20 mL) and the resultingprecipitate was collected by filtration. The obtained solids werechromatographed over silica gel (Isco CombiFlash Rf unit, 12 g Redisepcolumn, 0 to 50% EtOAc in hexanes) to provide(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(2-chloro-5-fluorophenyl)piperidin-1-yl)methanone as a white solid (50 mg, 42%): ¹H NMR (500 MHz,DMSO-d₆) δ 9.13-9.11 (m, 1H), 7.98 (dd, J=9.5, 1.0 Hz, 1H), 7.71 (dd,J=9.5, 1.5 Hz, 1H), 7.50 (dd, J=9.0, 5.5 Hz, 1H), 7.28 (dd, J=25, 3.0Hz, 1H), 7.15-7.10 (m, 1H), 5.28-5.20 (m, 1H), 4.76-4.70 (m, 1H),3.42-3.29 (m, 2H, overlaps with H₂O), 3.07-2.98 (m, 1H), 1.96-1.65 (m,4H).

Step B: A solution of(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(2-chloro-5-fluorophenyl)piperidin-1-yl)methanone(50 mg, 0.21 mmol) in DMF (2.0 mL) zinc cyanide (48 mg, 0.41 mmol) wassparged with Ar for 20 min. To the solution was added Pd(PPh₃)₄ (13 mg,0.011 mmol) and the vessel was sealed and heated to 130° C. withmicrowaves for 30 min. The mixture was diluted with saturated sodiumbicarbonate solution (10 mL) and extracted with EtOAc (4×30 mL). Thecombined organic extracts were concentrated to dryness under reducedpressure. The resulting residue was chromatographed over silica gel(Isco CombiFlash Rf unit, 12 g Redisep column, 0% to 50% EtOAc inhexanes) and freeze dried to give3-(4-(2-chloro-5-fluorophenyl)piperidine-1-carbonyl)-[1,2,4]triazolo[4,3-a]pyridine-6-carbonitrileas a white solid (21 mg, 54%): mp 211-214° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 9.52-9.50 (m, 1H), 8.13 (dd, J=9.5, 1.0 Hz, 1H), 7.81 (dd, J=9.5, 1.5Hz, 1H), 7.50 (dd, J=9.0, 5.5 Hz, 1H), 7.28 (dd, J=10.5, 3.5 Hz, 1H),7.16-7.11 (m, 1H), 5.16-5.11 (m, 1H), 4.78-4.71 (m, 1H), 3.46-3.30 (m,2H, overlaps with H₂O), 3.11-3.01 (m, 1H), 1.99-1.70 (m, 4H); ESI MS m/z384 [M+H]+.

Example 84 Preparation of(4-(2-chloro-3-(fluorophenyl)piperidin-1-yl)(6-cyclopropylmethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-yl)methanone(146)

Step A: Following general procedure GP-G2,(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (40) and cyclopropane carbaldehyde were converted to(4-(2-chloro-3-(fluorophenyl)piperidine-1-yl)(6-cyclopropylmethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-yl)methanoneas a white solid (21 mg, 36%): mp 187-191° C.; ¹H NMR (300 MHz, DMSO-d₆)δ 12.74 (br s, 1H), 7.38-7.24 (m, 3H), 4.96-4.55 (m, 2H), 3.57 (s, 2H),3.28-3.17 (m, 2H), 2.91-2.38 (m, 7H), 1.91-1.79 (m, 2H), 1.64-1.56 (m,2H), 0.92-0.85 (m, 1H), 0.52-0.48 (m, 2H), 0.16-0.08 (m, 2H); ESI MS m/z417 [M+H]+.

Example 85 Preparation of Methyl3-(4-(2-chloro-3-fluorophenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate(147)

Step A: Following general procedure GP-E1,(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (40) and methyl chloroformate were converted to methyl3-(4-(2-chloro-3-fluorophenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylateas a white solid (30 mg, 65%): mp 182-185° C.; ¹H NMR (300 MHz, DMSO-d₆)δ 12.88 (br s, 1H), 7.39-7.24 (m, 3H), 4.85-4.61 (m, 2H), 4.54-4.49 (m,2H), 3.64-3.56 (m, 5H), 3.28-3.12 (m, 2H), 2.93-2.75 (m, 1H), 2.61-2.55(m, 2H), 1.91-1.78 (m, 2H), 1.64-1.55 (m, 2H); ESI MS m/z 421 [M+H]+.

Example 86 Preparation of3-(4-(2-chloro-3-fluorophenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carbonitrile (148)

Step A: Following general procedure GP-G2,(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (40) and cyanogen bromide were converted to3-(4-(2-chloro-3-fluorophenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carbonitrileas a white solid (19 mg, 35%): mp 182-185° C.; ¹H NMR (300 MHz, DMSO-d₆)δ 12.98 (br s, 1H), 7.37-7.24 (m, 3H), 4.91-4.65 (m, 2H), 4.47-4.40 (m,2H), 3.43-3.12 (m, 4H), 2.93-2.69 (m, 3H), 1.91-1.78 (m, 2H), 1.76-1.55(m, 2H); ESI MS m/z 388 [M+H]+.

Example 87 Preparation of(4-(2-chloro-3-(fluorophenyl)piperidin-1-yl)(6-oxetan-3-yl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-yl)methanone(149)

Step A: Following general procedure GP-G1,(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (40) and oxetan-3-one were converted to(4-(2-chloro-3-(fluorophenyl)piperidine-1-yl)(6-oxetan-3-yl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-yl)methanoneas a white solid (17 mg, 31%): ¹H NMR (300 MHz, DMSO-d₆) δ 12.77 (br s,1H), 7.37-7.24 (m, 3H), 4.91-4.47 (m, 6H), 3.71-3.61 (m, 1H), 3.47-3.12(m, 4H), 2.93-2.78 (m, 1H), 2.74-2.53 (m, 4H), 1.91-1.78 (m, 2H),1.76-1.55 (m, 2H); ESI MS m/z 419 [M+H]+.

Example 88 Preparation of 1-(3-(4-(2-chloro-3-fluorophenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridin-6(7H)-yl)ethanone(150)

Step A: Following general procedure GP-E1,(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (40) and acetyl chloride were converted to1-(3-(4-(2-chloro-3-fluorophenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridin-6(7H)-yl)ethanoneas a white solid (14 mg, 25%): ¹H NMR (500 MHz, DMSO-d₆) δ 13.18-12.83(m, 1H), 7.41-7.31 (m, 1H), 7.30-7.22 (m, 2H), 4.87-4.74 (m, 1H),4.73-4.63 (m, 1H), 4.62-4.53 (m, 2H), 3.71-3.58 (m, 2H), 3.31-3.24 (m,1H, overlaps with H₂O), 3.20-3.12 (m, 1H), 2.90-2.76 (m, 1H), 2.74-2.52(m, 2H), 2.11-2.07 (m, 3H), 1.89-1.72 (m, 2H), 1.65-1.52 (m, 2H); ESI MSm/z 405 [M+H]+; HPLC >99% purity (Method H). (m, 3H), 4.91-4.47 (m, 6H),3.71-3.61 (m, 1H), 3.47-3.12 (m, 4H), 2.93-2.78 (m, 1H), 2.74-2.53 (m,4H), 1.91-1.78 (m, 2H), 1.76-1.55 (m, 2H); ESI MS m/z 419 [M+H]+.

Example 89 Preparation of(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(5-(methylsulfonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-ylmethanone(151)

Step A: Following general procedure GP-C,((4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (40) and methanesulfonyl chloride were converted to1-(3-(4-(2-chloro-3-fluorophenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(5-(methylsulfonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-ylmethanoneas a white solid (21 mg, 34%): mp 247-253° C. decomp.; ¹H NMR (500 MHz,DMSO-d₆) δ 13.03 (br s, 1H), 7.39-7.31 (m, 1H), 7.29-7.22 (m, 2H),5.28-5.19 (m, 1H), 4.72-4.63 (m, 1H), 4.39-4.28 (m, 2H), 3.50-3.14 (m,7H, overlaps with H₂O), 2.86-2.79 (m, 3H), 1.91-1.76 (m, 2H), 1.69-1.53(m, 2H); ESI MS m/z 441 [M+H]+.

Example 90 Preparation of(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)methanone(152)

Step A: To a solution of ethyl6-bromo-[1,2,4]triazolo[4,3-a]pyridine-3-carboxylate (102 mg, 0.38 mmol)in THF (3.1 mL) was added a solution of LiOH monohydrate (16 mg, 0.38mmol) in H₂O (2.0 mL). The mixture stirred for 20 min and wasneutralized with 2 N HCl. The mixture was concentrated under reducedpressure. The obtained residue was diluted in DMF (4.0 mL) under anatmosphere of N2. To this mixture was added4-(2-chloro-3-fluorophenyl)piperidine hydrochloride (14, 94 mg, 0.38mmol), benzotriazole-1-yl-oxy-tris-(dimethylamino)-phosphoniumhexafluorophosphate (334 mg, 0.76 mmol), and diisopropylethylamine (0.20mL, 1.1 mmol). The mixture was stirred at ambient temperature for 18 h.The resulting mixture was diluted with H₂O (20 mL) and the resultingprecipitate was collected by filtration. The obtained solids werechromatographed over silica gel (Isco CombiFlash Rf unit, 12 g Redisepcolumn, 0 to 50% EtOAc in hexanes) to provide(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)methanoneas a white solid (80 mg, 48%): ¹H NMR (300 MHz, DMSO-d₆) δ 9.11 (br s,1H), 8.03-7.95 (m, 1H), 7.71 (dd, J=9.6, 1.8 Hz, 1H), 7.43-7.23 (m, 3H),5.27-5.17 (m, 1H), 4.80-4.69 (m, 1H), 3.48-3.34 (m, 2H), 3.12-2.96 (m,1H), 2.02-1.59 (m, 4H); ESI MS m/z 438 [M+H]+.

Step B: A solution of(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)methanone(80 mg, 0.18 mmol) in DMF (2.0 mL) with zinc cyanide (43 mg, 0.65 mmol)was sparged with Ar for 20 min. To the solution was added Pd(PPh₃)₄ (21mg, 0.018 mmol) and the vessel was sealed and heated to 130° C. withmicrowaves for 30 min. The mixture was diluted with H₂O (10 mL) andextracted with EtOAc (4×30 mL). The combined organic extracts wereconcentrated to dryness under reduced pressure. The resulting residuewas chromatographed over silica gel (Isco CombiFlash Rf unit, 12 gRedisep column, 0% to 60% EtOAc in hexanes) and freeze dried to give3-(4-(2-chloro-3-fluorophenyl)piperidine-1-carbonyl)-(1,2,4]triazolo[4,3-a]pyridine-6-carbonitrileas a white solid (38 mg, 55%): mp 158-163° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 9.51-9.50 (m, 1H), 8.12 (dd, J=9.5, 1.0 Hz, 1H), 7.81 (dd, J=9.5, 1.5Hz, 1H), 7.41-7.34 (m, 1H), 7.31-7.24 (m, 2H), 5.16-5.09 (m, 1H),4.78-4.71 (m, 1H), 3.47-3.37 (m, 2H), 3.12-3.03 (m, 1H), 2.00-1.64 (m,4H); ESI MS m/z 384 [M+H]+.

Example 91 Preparation of1-(3-(4-(3,5-bis(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridin-6(7H)-yl)ethanone(153)

Step A: Following general procedure GP-E1,4-(3,5-bis(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (52) and acetyl chloride were converted to1-(3-(4-(3,5-bis(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridin-6(7H)-yl)ethanone as a white solid (33 mg, 50%): mp 204-205° C.; ¹H NMR (500 MHz,DMSO-d₆) δ 13.13-12.82 (m, 1H), 8.01-7.97 (m, 2H), 7.96-7.90 (m, 1H),4.92-4.79 (m, 1H), 4.75-4.63 (m, 1H), 4.62-4.53 (m, 2H), 3.72-3.58 (m,2H), 3.18-3.05 (m, 2H), 2.84-2.48 (m, 3H, overlaps with solvent),2.12-2.05 (m, 3H), 1.97-1.78 (m, 2H), 1.76-1.61 (m, 2H); ESI MS m/z 489[M+H]+.

Example 92 Preparation of (4-(3,5-bis(trifluoromethyl)phenyl)piperidin-1-yl)(5-(methylsulfonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(154)

Step A: Following general procedure GP-C,(4-(3,5-bis(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone hydrochloride (52) and methanesulfonyl chloride were convertedto (4-(3,5-bis(trifluoromethyl)phenyl)piperidin-1-yl-(5-(methylsulfonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneas a white solid (25 mg, 37%): ¹H NMR (500 MHz, DMSO-d₆) δ 13.02 (s,1H), 8.01-7.98 (m, 2H), 7.94-7.91 (m, 1H), 5.31-5.24 (m, 1H), 4.73-4.63(m, 1H), 4.40-4.26 (m, 2H), 3.51-3.41 (m, 2H), 3.21-3.06 (m, 2H), 2.93(s, 3H), 2.85-2.74 (m, 3H), 1.96-1.80 (m, 2H), 1.79-1.64 (m, 2H); ESI MSm/z 525 [M+H]+.

Example 93 Preparation of(4-(3,5-bis(trifluoromethyl)phenyl)piperidin-1-yl)(5-(methylsulfonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(155)

Step A: To a solution of ethyl6-methoxy-[1,2,4]triazolo[4,3-a]pyridine-3-carboxylate (66 mg, 0.30mmol) in THF (2.5 mL) was added a solution of LiOH monohydrate (25 mg,0.60 mmol) in H₂O (1.6 mL). The mixture stirred for 20 min and wasneutralized with 2 N HCl. The mixture was concentrated under reducedpressure. The obtained residue was diluted in DMF (3.3 mL) under anatmosphere of N₂. To this mixture was added4-(3,5-bis(trifluoromethyl)phenyl)piperidine hydrochloride (20, 100 mg,0.30 mmol), benzotriazole-1-yl-oxy-tris-(dimethylamino)-phosphoniumhexafluorophosphate (266 mg, 0.60 mmol), and diisopropylethylamine (0.16mL, 0.90 mmol). The mixture was stirred at ambient temperature for 18 h.The resulting mixture was diluted with H₂O (20 mL) and extracted withEtOAc (4×30 mL). The combined organic extracts were washed with asaturated brine solution (3×30 ml) and concentrated under reducedpressure. The obtained residue was chromatographed over silica gel (IscoCombiFlash Rf unit, 24 g Redisep column, 0% to 2% MeOH in CH₂Cl₂ with0.1% NH₄OH in CH₂Cl₂). The obtained residue was dissolved in CH₂Cl₂ (10mL) and hexanes (100 mL). The solution was partially concentrated andthe resulting solids were collected by filtration to provide(4-(3,5-bis(trifluoromethyl)phenyl)piperidin-1-yl)(6-methoxy-[1,2,4]triazolo[4,3-a]pyridin-3-yl)methanone as an off-white solid (80 mg, 56%): mp 146-149° C.; ¹H NMR(500 MHz, DMSO-d₆) δ 8.55 (d, J=2.0 Hz, 1H), 8.03 (s, 2H), 7.95-7.89 (m,2H), 7.38 (dd, J=10, 2.5 Hz, 1H), 5.40-5.33 (m, 1H), 4.81-4.73 (m, 1H),3.85 (s, 3H), 3.39-3.31 (m, 1H, overlaps with H₂O), 3.26-3.16 (m, 1H),3.02-2.93 (m, 1H), 2.03-1.77 (m, 4H); ESI MS m/z 473 [M+H]+.

Example 94 Preparation of1-(3-(4-(2-fluoro-6-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridin-6(7H)-yl) ethanone (156)

Step A: Following general procedure GP-E1,(4-(2-fluoro-6-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (56) and acetyl chloride were converted to1-(3-(4-(2-fluoro-6-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridin-6(7H)-yl)ethanoneas a white solid (33 mg, 43%): ¹H NMR (500 MHz, DMSO-d₆) δ 13.26-12.80(m, 1H), 7.61-7.56 (m, 1H), 7.56-7.47 (m, 2H), 4.87-4.49 (m, 4H),3.72-3.56 (m, 2H), 3.25-3.04 (m, 2H), 2.84-2.53 (m, 3H), 2.07-1.89 (m,5H), 1.79-1.64 (m, 2H); ESI MS m/z 439 [M+H]+.

Example 95 Preparation of 3-(4-(2-fluoro-6-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-[1,2,4]triazolo[4,3-a]pyridine-6-carbonitrile(157)

Step A: To a solution of ethyl6-bromo-[1,2,4]triazolo[4,3-a]pyridine-3-carboxylate (72 mg, 0.27 mmol)in THF (2.2 mL) was added a solution of LiOH monohydrate (12 mg, 0.29mmol) in H₂O (1.5 mL). The mixture stirred for 20 min and wasneutralized with 2 N HCl. The mixture was concentrated under reducedpressure. The obtained residue was diluted in DMF (2.8 mL) under anatmosphere of N₂. To this mixture was added4-(2-fluoro-6-(trifluoromethyl)phenyl)piperidine hydrochloride (23, 75mg, 0.27 mmol), benzotriazole-1-yl-oxy-tris-(dimethylamino)-phosphoniumhexafluorophosphate (236 mg, 0.53 mmol), and diisopropylethylamine (0.14mL, 0.80 mmol). The mixture was stirred at ambient temperature for 18 h.The resulting mixture was diluted with H₂O (20 mL) and extracted withEtOAc (3×30 mL). The combined organic extracts were washed with asaturated brine solution (30 mL) and concentrated under reducedpressure. The obtained residue was chromatographed over silica gel (IscoCombiFlash Rf unit, 12 g Redisep column, 0 to 50% EtOAc in hexanes) toprovide(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(2-fluoro-6-(trifluoromethyl)phenyl)piperidin-1-yl)methanoneas a light orange film (80 mg, 64%): ¹H NMR (300 MHz, DMSO-d₆) δ9.12-9.10 (m, 1H), 8.00-7.95 (m, 1H), 7.74-7.68 (m, 1H), 7.65-7.50 (m,3H), 5.29-5.15 (m, 1H), 4.82-4.68 (m, 1H), 3.41-3.19 (m, 2H, overlapswith H₂O), 3.07-2.97 (m, 1H), 2.34-2.19 (m, 1H), 2.15-2.02 (m, 1H),1.93-1.75 (m, 2H); ESI MS m/z 472 [M+H]+.]

Step B: A solution of(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(2-fluoro-6-(trifluoromethyl)phenyl)piperidin-1-yl)methanone(80 mg, 0.17 mmol) in DMF (2.0 mL) with zinc cyanide (40 mg, 0.34 mmol)was sparged with Ar for 15 min. To the solution was added Pd(PPh₃)₄ (19mg, 0.017 mmol) and the vessel was sealed and heated to 130° C. withmicrowaves for 30 min. The mixture was diluted with saturated sodiumbicarbonate solution (20 mL) and extracted with EtOAc (3×30 mL). Thecombined organic extracts were washed with a saturated brine solution(2×30 mL) and concentrated to dryness under reduced pressure. Theresulting residue was chromatographed over silica gel (Isco CombiFlashRf unit, 12 g Redisep column, 0% to 50% EtOAc in hexanes) followed byHPLC (Phenomenex Luna C₁₈ (2), 250.0×50.0 mm, 15 micron, H₂O with 0.05%TFA and CH₃CN with 0.05% TFA) and was washed with saturated sodiumbicarbonate solution, and freeze dried to give3-(4-(2-fluoro-6-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-[1,2,4]triazolo[4,3-a]pyridine-6-carbonitrileas a white solid (23 mg, 33%): ¹H NMR (500 MHz, DMSO-d₆) δ 9.54-9.52 (m,1H), 8.14-8.11 (m, 1H), 7.82-7.78 (m, 1H), 7.64-7.59 (m, 1H), 7.57-7.50(m, 2H), 5.17-5.10 (m, 1H), 4.79-4.72 (m, 1H), 3.40-3.24 (m, 2H,overlaps with H₂O), 3.07-2.98 127 (m, 1H), 2.30-2.19 (m, 1H), 2.14-2.03(m, 1H), 1.91-1.79 (m, 2H); ESI MS m/z 418 [M+H]+.

Example 96 Preparation of1-(3-(4-(4-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridin-6(7H)-yl)ethanone(158)

Step A: A solution of tert-butyl4-(((trifluoromethyl)sulfonyl)oxy)-5,6-dihydropyridine-1(2H)-carboxylate(1.50 g, 4.53 mmol) in 1,2-dimethoxyethane (25 mL) was sparged with N₂for 30 min. 4-Fluoro-(2-trifluoromethyl)phenyl boronic acid (1.13 g,5.43 mmol) was added followed by a 2 M solution of sodium carbonate (2.9mL). The resulting mixture was sparged with N₂ for 10 min. Pd(PPh₃)₄(260 mg, 0.225 mmol) was added and the resulting mixture was heated to80° C. under an atmosphere of N₂. After 72 h, the resulting solution wascooled to ambient temperature and diluted with 5% lithium chloridesolution (100 mL). The solution was extracted with EtOAc (3×50 mL). Thecombined organic extracts were washed with saturated brine (2×50 mL) andconcentrated to dryness under reduced pressure. The residue waschromatographed over silica gel (Isco CombiFlash Rf unit, 24 g Redisepcolumn, 0% to 100% EtOAc in hexanes) to provide tert-butyl4-(4-fluoro-2-(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylateas a brown oil (1.29 g, 83%): ¹H NMR (300 MHz, CDCl₃) δ 7.37-7.08 (m,3H), 5.57 (br s, 1H), 4.02-3.99 (m, 2H), 3.62-3.58 (m, 2H), 2.32 (br s,2H), 1.46 (s, 9H).

Step B: A solution of tert-butyl4-(4-fluoro-2-(tri-fluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylate(1.29 g, 3.74 mmol) in ethyl acetate (20 mL) andacetic acid (0.22 mL)was sparged with N₂. Platinum dioxide (84 mg) was added and theresulting suspension was sparged with N₂ for 5 min. The mixture wasplaced under an H₂ atmosphere at 1 atm. After 18 h the reaction wassparged with N₂ for 15 min, filtered through a diatomaceous earth pad,recharged with platinum dioxide (100 mg) and stirred under a 1 atmhydrogen atmosphere. The filtration and recharging of the reaction wasrepeated thrice over the next 64 h. The reaction was filtered throughdiatomaceous earth. The obtained filtrate was washed with sodiumbicarbonate solution, dried (Na₂SO₄) and concentrated under reducedpressure. The residue was chromatographed over silica gel (IscoCombiFlash Rf unit, 24 g Redisep column, 0% to 100% EtOAc in hexanes) toprovide tert-butyl4-(4-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carboxylate as ayellow oil (0.813 g, 63%): ¹H NMR (300 MHz, CDCl₃) δ 7.37-7.20 (m, 3H),4.27-4.22 (m, 2H), 3.07-2.99 (m, 1H), 2.85-2.75 (m, 2H), 2.04-1.46 (m,13H).

Step C: To a solution of tert-butyl4-(4-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carboxylate (0.813 g,2.34 mmol) in diethyl ether (6 mL) was added 2 M HCl in diethyl ether(10 mL).

The mixture stirred for 18 h at ambient temperature. The reactionmixture was concentrated under reduced pressure and the residuetriturated with diethyl ether (10 mL). The solids were collected byfiltration to give 4-(4-fluoro-2-(trifluoromethyl)phenylpiperidinehydrochloride as a white solid (0.244 g, 37%): ¹H NMR (300 MHz, CDCl₃) δ9.79 (br s, 1H), 7.59-7.54 (m, 1H), 7.37-7.24 (m, 2H), 3.68-3.64 (m,2H), 3.27-3.03 (m, 4H), 2.39-2.27 (m, 2H), 2.01-1.96 (m, 2H); ESI MS m/z248 [M+H]+.

Step D: To a solution of 4-(4-fluoro-2-trifluoromethyl)phenylpiperidinehydrochloride (75 mg, 0.26 mmol),6-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxylicacid (75 mg, 0.29 mmol), and diisopropylethylamine (0.14 mL, 0.80 mmol)in DMF (3 mL) under an atmosphere of N₂ was added EDC (70 mg, 0.37 mmol)and HOBt (49 mg, 0.36 mmol). The resulting solution was stirred atambient temperature for 24 h. The reaction mixture was diluted with H₂O(30 mL) and extracted with EtOAc (3×10 mL). The combined organicextracts were washed with brine (1×20 mL) and concentrated to drynessunder reduced pressure. The obtained residue was chromatographed oversilica gel (Isco CombiFlash Rf unit, 12 g Redisep column, 0% to 100%ethyl acetate in hexanes) to provide tert-butyl3-(4-(4-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylateas a white solid (75 mg, 58%): ¹H NMR (300 MHz, DMSO-d₆) δ 12.04 (br s,1H), 7.72-7.68 (m, 1H), 7.57-7.49 (m, 2H), 4.84-4.64 (m, 1H), 4.49-4.45(m, 2H), 3.56-3.53 (m, 2H), 3.08 (br s, 2H), 2.78-2.50 (m, 4H), 1.75 (brs, 4H), 1.42 (s, 9H); ESI MS m/z 497 [M+H]+.

Step E: To a solution of tert-butyl3-(4-(4-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridine-6(7H)-carboxylate(74 mg, 0.15 mmol) in CH₂Cl₂ (3 mL) and methanol (1 mL) was added 2 NHCl (2 mL, 2M in Et₂O). The mixture stirred for 4 h at ambienttemperature. The reaction mixture was diluted with Et₂₀ (30 mL) and theresulting solids were collected by filtration to give(4-(4-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride as a white solid (64 mg, 98%): ¹H NMR (300 MHz, DMSO-d₆) δ13.14 (s, 1H), 9.16 (br s, 2H), 7.73-7.68 (m, 1H), 7.59-7.50 (m, 2H),4.84-4.69 (m, 1H), 4.32-4.25 (m, 2H), 3.26-3.03 (m, 2H), 2.89-2.81 (m,2H), 2.68-2.48 (m, 4H), 1.73 (m, 4H); ESI MS m/z 397 [M+H]+.

Step F: To a solution of(4-(4-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridin-3-yl)methanonehydrochloride (63 mg, 0.15 mmol) and diisopropylethylamine (70 L, 0.40mmol) in DMF (3.0 mL) was added acetyl chloride (11 μL, 0.15 mmol). Themixture was stirred for 16 hour. The solvent was removed under reducedpressure and the residue was diluted with H₂O (10 mL) and extracted withEtOAc (2×10 mL). The combined organic extracts were washed withsaturated brine (1×20 mL), dried over Na₂SO₄ and concentrated to drynessunder reduced pressure. The resulting residue was chromatographed oversilica gel (Isco CombiFlash Rf unit, 12 g Redisep column, 0% to 100%(10% CH₃OH in CH₂Cl₂ with 0.01% NH₄OH) in CH₂Cl₂) and further purifiedby reverse phase chromatography (Isco CombiFlash Rf unit, 12 g Redisepc18 gold column, 0% to 100% acetonitrile in water) to give1-(3-(4-(4-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]pyridin-6(7H)-yl)ethanoneas a white solid (20 mg, 94%): mp 176-180° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 12.86 (s, 1H), 7.71-7.68 (m, 1H), 7.56-7.49 (m, 2H), 4.94-4.55 (m,3H), 3.66-3.62 (m, 2H), 3.10 (br s, 2H), 2.85-2.48 (m, 4H), 2.10-2.08(m, 3H), 1.73 (m, 4H); ESI MS m/z 439 [M+H]+.

Example 97 Preparation of (4-(4-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(methylsulfonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridine-3-yl)methanone(159)

Step A: To a solution of 4-(4-fluoro-2-trifluoromethyl)phenylpiperidinehydrochloride (75 mg, 0.26 mmol),5-(tert-butoxycarbonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridine-3-carboxylicacid (75 mg, 0.29 mmol), and diisopropylethylamine (0.14 mL, 0.80 mmol)in DMF (3.0 mL) under an atmosphere of N2 was added EDCI (70 mg, 0.37mmol) and HOBt (49 mg, 0.36 mmol). The resulting solution was stirred atambient temperature for 16 h. The reaction mixture was diluted with H₂O(30 mL) and extracted with EtOAc (3×30 mL). The combined organicextracts were washed with brine (1×30 mL) and concentrated to drynessunder reduced pressure. The obtained residue was chromatographed oversilica gel (Isco CombiFlash Rf unit, 12 g Redisep column, 0% to 100%ethyl acetate in hexanes) to provide tert-butyl3-(4-(4-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-6,7-dihydro-1H-pyrazolo[4,3-c]pyridine-5(4H)-carboxylateas a white solid (109 mg, 77%): ¹H NMR (300 MHz, DMSO-d₆) δ 12.96 (s,1H), 7.70-7.68 (m, 1H), 7.57-7.49 (m, 2H), 5.32-5.13 (m, 1H), 4.74-4.64(m, 1H), 4.47-4.45 (m, 2H), 3.59 (br s, 2H), 3.22-3.10 (m, 2H),2.82-2.50 (m, 3H), 1.73 (br s, 4H), 1.42 (s, 9H); ESI MS m/z 497 [M+H]+.

Step B: To a solution of tert-butyl 3-(4-(4-fluoro-2-(trifluoromethylphenyl)piperidine-1-carbonyl)-4,5-dihydro-1H-pyrazolo[3,4-c]-pyridine-5(4H)-carboxylate(85 mg, 0.17 mmol) in CH₂Cl₂ (3 mL) and methanol (1 mL) was added 2 NHCl (2 mL, 2M in Et₂O). The mixture stirred for 4 h at ambienttemperature. The reaction mixture was diluted with Et₂O (30 mL) and theresulting solids were collected by filtration to give(4-(4-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride as an off-white solid (78 mg, >99%): ¹H NMR (300 MHz,DMSO-d₆) δ 13.14 (br s, 1H), 9.13 (br s, 2H), 7.73-7.67 (m, 1H),7.58-7.50 (m, 2H), 5.32-4.69 (m, 3H), 4.24 (s, 2H), 3.38 (br s, 2H),3.21 3.07 (m, 2H), 2.96-2.72 (m, 3H), 1.75 (m, 4H); ESI MS m/z 397[M+H]+.

Step C: To a solution of (4-(4-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (38 mg, 0.088 mmol) and diisopropylethylamine (35 μL, 0.20mmol) in DMF (2.0 mL) was added methanesulfonyl chloride (9 L, 0.12mmol). The mixture was stirred for 16 h at ambient temperature. Thesolvent was removed under reduced pressure and the residue diluted withH₂O (10 mL) and extracted with ethyl acetate (3×10 mL). The combinedorganic extracts were dried (Na₂SO₄) and concentrated under reducedpressure. The obtained solids were chromatographed over silica gel (IscoCombiFlash Rf unit, 12 g Redisep column, 0% to 100% (10% CH₃₀H in CH₂Cl₂with 0.01% NH₄OH) in CH₂Cl₂) and freeze dried to give(4-(4-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(methylsulfonyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneas a white solid (4 mg, 10%): ¹H NMR (300 MHz, DMSO-d₆) δ 13.05 (s, 1H),7.73-7.69 (m, 1H), 7.57-7.46 (m, 2H), 5.28-5.24 (m, 1H), 4.70-4.65 (m,1H), 4.38-4.33 (m, 2H), 3.51-3.45 (m, 2H), 3.22-3.10 (m, 2H), 2.94 (s,3H), 2.84-2.70 (m, 3H), 1.73 (br s, 4H); ESI MS m/z 475 [M+H]+.

Example 98 Preparation of3-(4-(4-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-[1,2,4]triazolo[4,3-a]pyridine-6-carbonitrile(160)

Step A: To a solution of ethyl6-bromo-[1,2,4]triazolo[4,3-a]pyridine-3-carboxylate (81 mg, 0.30 mmol)in THF (2.5 mL) was added a solution of LiOH monohydrate (14 mg, 0.30mmol) in H₂O (1.7 mL). The mixture stirred for 20 min and wasneutralized with 2 N HCl. The mixture was concentrated under reducedpressure. The obtained residue was diluted in DMF (3.2 mL) under anatmosphere of N₂. To this mixture was added4-(4-fluoro-2-(trifluoromethyl)phenyl)piperidine hydrochloride (85 mg,0.30 mmol), benzotriazole-1-yl-oxy-tris-(dimethylamino)-phosphoniumhexafluorophosphate (267 mg, 0.60 mmol), and diisopropylethylamine (0.15mL, 0.91 mmol). The mixture was stirred at ambient temperature for 18 h.The resulting mixture was diluted with H₂O (20 mL) and the resultingprecipitate was collected by filtration. The obtained solids werechromatographed over silica gel (Isco CombiFlash Rf unit, 12 g Redisepcolumn, 0 to 50% EtOAc in hexanes) to provide(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(4-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanoneas an orange film (92 mg, 64%): ¹H NMR (300 MHz, DMSO-d₆) δ 9.13 (dd,J=1.7, 0.9 Hz 1H), 7.98 (dd, J=10, 0.9 Hz, 1H), 7.77-7.69 (m, 2H),7.60-7.47 (m, 2H), 5.30-5.18 (m, 1H), 4.77-4.68 (m, 1H), 3.43-3.34 (m,1H), 3.28-3.12 (m, 1H), 3.11-2.90 (m, 1H), 1.97-1.69 (m, 4H); ESI MS m/z472 [M+H]+.

Step B: A solution of(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(4-fluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanone(90 mg, 0.19 mmol) in DMF (2.2 mL) zinc cyanide (45 mg, 0.38 mmol) wassparged with Ar for 15 min. To the solution was added Pd(PPh₃)₄ (22 mg,0.019 mmol) and the vessel was sealed and heated to 130° C. microwavesfor 30 min. The mixture was diluted with saturated sodium bicarbonatesolution (10 mL) and extracted with EtOAc (3×20 mL). The combinedorganic extracts were washed with saturated brine solution (30 mL) andconcentrated to dryness under reduced pressure. The resulting residuewas chromatographed over silica gel (Isco CombiFlash Rf unit, 12 gRedisep column, 0% to 50% EtOAc in hexanes) followed by HPLC (PhenomenexLuna C₁₈ (2), 250.0×50.0 mm, 15 micron, H₂O with 0.05% TFA and CH₃CNwith 0.05% TFA) and was washed with saturated sodium bicarbonatesolution (3×30 mL) then freeze dried to provide3-(4-(4-fluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-[1,2,4]triazolo[4,3-a]pyridine-6-carbonitrileas a white solid (32 mg, 40%): mp 158-162° C.; ¹H NMR (300 MHz, DMSO-d₆)δ 9.53 (s, 1H), 8.14 (dd, J=9.0, 0.9 Hz, 1H), 7.82 (dd, J=9.6, 1.5 Hz,1H), 7.77-7.67 (m, 1H), 7.61-7.47 (m, 2H), 5.19-5.04 (m, 1H), 4.80-4.67(m, 1H), 3.46-3.14 (m, 2H, overlaps with H₂O), 3.12-2.94 (m, 1H),2.02-1.70 (m, 4H); ESI MS m/z 418 [M+H]+.

Example 99 Preparation of3-(3-(4-(5-Chloro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-[1,2,4]triazolo[4,3-a]pyridine-6-carbonitrile(161)

Step A: A mixture of (5-chloro-2-(trifluoromethyl)phenyl)boronic acid(0.453 g, 2.02 mmol), tert-butyl4-(((trifluoromethyl)sulfonyl)oxy)-5,6-dihydropyridine-1(2H)-carboxylate(0.669 g, 2.02 mmol), tetrakis(triphenylphosphine)palladium (0.117 g,0.1 mmol), sodium carbonate (2 M, 5 mL), and 1,2-dimethoxyethane (10 mL)was heated at 80° C. under microwave irradiation for 1.5 h. Aftercooling to ambient temperature, the mixture was diluted with water (80mL) and extracted with ethyl acetate (80 mL). The extract was washedwith brine (2×50 mL), dried over Na₂SO₄, filtered, and concentratedunder reduced pressure. The resulting residue was chromatographed oversilica gel (0-25% EtOAc in hexanes) to give tert-butyl4-(5-chloro-2-(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylateas colorless oil (0.614 g, 84%): ¹H NMR (300 MHz, CDCl₃) δ 7.59 (d,J=8.5 Hz, 1H), 7.37-7.22 (m, 1H), 7.22 (d, J=1.68 Hz, 1H), 5.60 (br,1H), 4.02 (br, 2H), 3.61 (br, 2H), 2.34 (br, 2H), 1.50 (s, 9H); MS(ESI+) m/z 306 [M+H]+.

Step B: A mixture of tert-butyl4-(5-chloro-2-(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylate(0.614 g, 1.70 mmol), platinum oxide (0.200 g, 0.881 mmol), acetic acid(1 mL), and ethyl acetate (15 mL) was hydrogenated using a balloon of H₂for 16 h and filtered. After concentration, the residue waschromatographed over silica gel (0-30% EtOAc in hexanes) to givetert-butyl4-(5-chloro-2-(trifluoromethyl)phenyl)piperidine-1-carboxylate ascolorless thick oil (0.302 g, 48%): ¹H NMR (300 MHz, CDCl₃) δ 7.56 (d,J=8.5 Hz, 1H), 7.38 (s, 1H), 7.29 (d, J=1.3 Hz, 1H), 4.26 (br, 2H), 3.04(m, 1H), 2.80 (m, 2H), 1.80-1.55 (m, 4H), 1.49 (s, 9H); MS (ESI+) m/z308 [M+H]+.

Step C: To a solution of tert-butyl4-(5-chloro-2-(trifluoromethyl)phenyl)piperidine-1-carboxylate (0.302 g,0.830 mmol) in dichloromethane (5 mL) was added HCl solution (2 M inether, 5 mL). The mixture was stirred for 4 h and evaporated to afford asolid that was dissolved in DMF (8 mL). In a separate flask, to asolution of ethyl 6-bromo-[1,2,4]triazolo[4,3-a]pyridine-3-carboxylate(0.224 g, 0.830 mmol) in THF (5 mL) was added a solution of lithiumhydroxide hydrate (0.035 g, 0.830 mmol) in water (2 mL). The mixture wasstirred for 20 min, acidified with 2 N HCl to PH 6 and evaporated todryness. To this residue were addedbenzotriazole-1-yl-oxytris(dimethylamino)phosphonium hexafluorophosphate(0.550 g, 1.25 mmol), N,N-diisopropylethylamine (0.646 g, 5.00 mmol),and the DMF solution obtained from the first reaction. The mixture wasstirred at ambient temperature for 16 h and poured into water. Themixture was extracted with ethyl acetate and the organic layer waswashed with brine for three times, dried over Na₂SO₄, filtered, andconcentrated under reduced pressure. The resulting residue waschromatographed over silica gel (0-60% EtOAc in hexanes) to give(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(5-chloro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanoneas a solid (0.205 g, 50%): ¹H NMR (300 MHz, CDCl₃) δ9.38 (m, 1H), 7.79(dd, J=9.6, 0.9 Hz, 1H), 7.60 (d, J=8.5 Hz, 1H), 7.50 (dd, J=9.6, 1.7Hz, 1H), 7.42 (d, J=1.4 Hz, 1H), 7.31 (dd, J=8.5, 1.3 Hz, 1H), 5.76-5.71(m, 1H), 5.01-4.95 (m, 1H), 3.38-3.26 (m, 2H), 3.02-2.92 (m, 1H),2.01-1.82 (m, 4H); MS (ESI+) m/z 489 [M+H]+.

Step D: A mixture of(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(5-chloro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanone(0.205 g, 0.42 mmol), zinc cyanide (0.099 g, 0.840 mmol),tetrakis(triphenylphosphine)palladium (0.048 g, 0.042 mmol), and DMF (4mL) was heated under microwave irradiation at 130° C. for 30 min. Aftercooling to ambient temperature, the mixture was diluted with water (80mL) and extracted with ethyl acetate (80 mL). The extract was washedwith brine (2×80 mL), dried (Na₂SO₄), filtered, and concentrated underreduced pressure. The resulting residue was chromatographed over silicagel (0-60% EtOAc in hexanes) to give3-(4-(5-chloro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-[1,2,4]triazolo[4,3-a]pyridine-6-carbonitrileas a white solid (0.115 g, 63%): ¹H NMR (300 MHz, CDCl₃) δ 9.72 (s, 1H),7.98 (dd, J=9.5, 1.1 Hz, 1H), 7.60 (d, J=8.5 Hz, 1H), 7.51 (dd, J=9.5,1.6 Hz, 1H), 7.41 (s, 1H), 7.31 (dd, J=8.5, 1.3 Hz, 1H), 5.77-5.72 (m,1H), 5.02-4.96 (m, 1H), 3.40 (m, 2H), 3.04-2.94 (m, 1H), 2.06-1.80 (m,4H); MS (ESI+) m/z 434 [M+H]+.

Example 100 Preparation of 3-(4-(3-Chloro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-[1,2,4]triazolo[4,3-a]pyridine-6-carbonitrile(162)

Step A: A mixture of (3-chloro-2-(trifluoromethyl)phenyl)boronic acid(0.453 g, 2.02 mmol), tert-butyl4-(((trifluoromethyl)sulfonyl)oxy)-5,6-dihydropyridine-1(2H)-carboxylate(0.669 g, 2.02 mmol), tetrakis(triphenylphosphine)palladium (0.117 g,0.1 mmol), sodium carbonate (2 M, 5 mL), and 1,2-dimethoxyethane (10 mL)was heated at 80° C. under microwave irradiation for 1 h. After coolingto ambient temperature, the mixture was diluted with water (80 mL) andextracted with ethyl acetate (80 mL). The extract was washed with brine(2×50 mL), dried (Na₂SO₄), filtered, and concentrated under reducedpressure. The resulting residue was chromatographed over silica gel(0-30% EtOAc in hexanes) to give tert-butyl4-(3-chloro-2-(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylateas colorless oil (0.438 g, 60%): ¹H NMR (300 MHz, CDCl₃) δ 7.44-7.34 (m,2H), 7.09 (m, 1H), 5.49 (br, 1H), 4.01 (br, 2H), 3.60 (br, 2H), 2.30(br, 2H), 1.50 (s, 9H); MS (ESI+) m/z 306 [M+H]+.

Step B: A mixture of tert-butyl4-(3-chloro-2-(trifluoromethyl)phenyl)-5,6-dihydropyridine-1(2H)-carboxylate(0.438 g, 1.21 mmol), platinum oxide (0.082 g, 0.363 mmol), acetic acid(0.073 g, 1.21 mmol), and ethyl acetate (20 mL) was hydrogenated using aballoon for 20 h and filtered. The material was re-submitted tohydrogenation at 80° C. for 16 h and filtered. After concentration, theresidue was chromatographed over silica gel (0-30% EtOAc in hexanes) togive tert-butyl4-(3-chloro-2-(trifluoromethyl)phenyl)piperidine-1-carboxylate ascolorless thick oil (0.115 g, 26%): ¹H NMR (300 MHz, CDCl₃) δ7.42-7.30(m, 3H), 4.25 (br, 2H), 3.21 (m, 1H), 2.81 (m, 2H), 1.80-1.60 (m, 4H),1.49 (s, 9H); MS (ESI+) m/z 308 [M+H]+.

Step C: To a solution of tert-butyl4-(3-chloro-2-(trifluoromethyl)phenyl)piperidine-1-carboxylate (0.115 g,0.316 mmol) in dichloromethane (3 mL) was added HCl (2 M in ether, 3mL). The mixture was stirred for 3 h and evaporated to afford a solidthat was dissolved in DMF (3 mL). In a separate flask, to a solution ofethyl 6-bromo-[1,2,4]triazolo[4,3-a]pyridine-3-carboxylate (0.094 g,0.348 mmol) in THF (3 mL) was added a solution of lithium hydroxidehydrate (0.015 g, 0.348 mmol) in water (1 mL). The mixture was stirredfor 20 min, acidified with 2 N HCl to PH 6 and evaporated. To theresidue were added benzotriazole-1-yl-oxy-tris(dimethylamino)phosphoniumhexa-fluorophosphate (0.210 g, 0.474 mmol), N,N-diisopropylethylamine(0.163 g, 1.26 mmol), and the DMF solution obtained from the firstreaction. The mixture was stirred at ambient temperature for 16 h andpoured into water. The mixture was extracted with ethyl acetate and theorganic layer was washed with brine for three times, dried (Na₂SO₄),filtered, and concentrated under reduced pressure. The resulting residuewas chromatographed over silica gel (0-60% EtOAc in hexanes) to give(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(3-chloro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanoneas a solid (0.076 g, 49%): ¹H NMR (300 MHz, CDCl₃) δ9.36 (m, 1H), 7.78(dd, J=9.6, 0.9 Hz, 1H), 7.50-7.34 (m, 4H), 5.73-5.68 (m, 1H), 5.00-4.94(m, 1H), 3.52-3.28 (m, 2H), 2.97 (m, 1H), 2.01-1.74 (m, 4H); MS (ESI+)m/z 489 [M+H]+.

Step D: A mixture of(6-bromo-[1,2,4]triazolo[4,3-a]pyridin-3-yl)(4-(3-chloro-2-(trifluoromethyl)phenyl)piperidin-1-yl)methanone(0.076 g, 0.156 mmol), zinc cyanide (0.037 g, 0.312 mmol), palladiumtetrakis(triphenylphosphine) (0.018 g, 0.0156 mmol), and DMF (2 mL) washeated under microwave irradiation at 130° C. for 30 min. After coolingto ambient temperature, the mixture was diluted with water (50 mL) andextracted with ethyl acetate (50 mL). The extract was washed with brine(2×50 mL), dried over Na₂SO₄, filtered, and concentrated under reducedpressure. The resulting residue was chromatographed over silica gel(0-60% EtOAc in hexanes) to give3-(4-(3-chloro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-[1,2,4]triazolo[4,3-a]pyridine-6-carbonitrileas a white solid (0.026 g, 38%): ¹H NMR (300 MHz, CDCl₃) δ9.70 (s, 1H),7.97 (dd, J=9.5, 1.0 Hz, 1H), 7.52-7.32 (m, 4H), 5.74-5.69 (m, 1H),5.00-4.95 (m, 1H), 3.52-3.31 (m, 2H), 2.99 (m, 1H), 2.06-1.75 (m, 4H);MS (ESI+) m/z 434 [M+H]+.

Example 101 Preparation of(4-(2-Chloro-3-fluorophenyl)piperidin-1-yl)(5-ethyl-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(163)

Step A: Following general procedure GP-D1,(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (42) and formaldehyde were converted to(4-(2-Chloro-3-fluorophenyl)piperidin-1-yl)(5-ethyl-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneas a white solid (25 mg, 32%): ¹H NMR (300 MHz, DMSO-d₆) δ 12.93 (m,1H), 7.56-7.32 (m, 3H), 5.16 (m, 1H), 4.81 (m, 1H), 2.61-3.42 (m, 9H),1.94-1.61 (m, 4H); ESI MS m/z 391 [M+H]⁺.

Example 102 Preparation of(4-(2-Chloro-3-fluorophenyl)piperidin-1-yl)(5-(cyclopropylmethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(164)

Step A: Following general procedure GP-D1,(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (42) and cyclopropyl-carboxaldehyde were converted to(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(5-(cyclopropylmethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneas a white solid (41 mg, 65%): ¹H NMR (300 MHz, DMSO-d₆) δ 12.91 (m,1H), 7.56-7.39 (m, 3H), 5.15 (m, 1H), 4.85 (m, 1H), 3.53 (m, 2H), 3.12(m, 1H), 2.62-2.35 (m, 5H), 2.43 (m, 2H), 1.87 (m, 2H), 1.63 (m, 2H),0.98 (m, 1H), 0.55 (m, 2H), 0.021 (m, 2H); ESI MS m/z 417 [M+H]⁺.

Example 103 Preparation of(4-(2-Chloro-3-fluorophenyl)piperidin-1-yl)(5-(oxetan-3-yl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(165)

Step A: Following general procedure GP-D1,(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (42) and 3-oxetanone were converted to(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(5-(oxetan-3-yl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneas a white solid (53 mg, 62%): ¹H NMR (300 MHz, DMSO-d₆) δ 12.91 (m,1H), 7.56-7.39 (m, 3H), 5.15 (m, 1H), 4.52-4.85 (m, 5H), 3.53 (m, 1H),3.12-3.40 (m, 3H), 2.82-265 (m, 3H), 1.72 (m, 2H), 1.53 (m, 2H); ESI MSm/z 419 [M+H]⁺.

Example 104 Preparation of(4-(2-Chloro-3-fluorophenyl)piperidin-1-yl)(5-(2,2,2-trifluoroethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(166)

Step A: Following general procedure GP-D2,(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (42) and 2,2,2-trifluoroethyl trifluoromethanesulfonatewere converted to(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(5-(2,2,2-trifluoroethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanoneas a white solid (56 mg, 62%): ¹H NMR (300 MHz, DMSO-d₆) δ 12.91 (m,1H), 7.56-7.39 (m, 3H), 5.15 (m, 1H), 4.73 (m, 1H), 3.82 (m, 2H), 3.32(m, 1H), 2.89 (m, 2H), 2.65 (m, 2H), 1.89 (m, 2H), 1.56 (m, 2H); ESI MSm/z 445 [M+H]⁺.

Example 105 Preparation of(4-(2-Chloro-3-fluorophenyl)piperidin-1-yl)(5-(3,3,3-trifluoropropyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(167)

Step A: Following general procedure GP-D2,(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (42) 3-bromo-1,1,1-trifluoropropane were converted to(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(5-(3,3,3-trifluoropropyl)-4,5,6,7-tetrahydro-H-pyrazolo[4,3-c]pyridin-3-yl)methanoneas a white solid (36 mg, 43%): ¹H NMR (300 MHz, DMSO-d₆) δ 13.01 (m,1H), 7.56-7.39 (m, 3H), 5.15 (m, 1H), 4.52 (m, 2H), 3.41 (m, 2H), 2.82(m, 3H), 1.89 (m, 2H), 1.56 (m, 2H); ESI MS m/z 459 [M+H]⁺.

Example 106 Preparation of(4-(2-Chloro-3-fluorophenyl)piperidin-1-yl)(5-(2-methoxyethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone(168)

Step A: Following general procedure GP-D2,(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanonehydrochloride (42) bromoethylmethyl ether were converted to(4-(2-chloro-3-fluorophenyl)piperidin-1-yl)(5-(2-methoxyethyl)-4,5,6,7-tetrahydro-1H-pyrazolo[4,3-c]pyridin-3-yl)methanone as a white solid (53 mg, 45%): ¹H NMR (300 MHz, DMSO-d₆) δ12.89 (m, 1H), 7.56-7.39 (m, 3H), 5.15 (m, 1H), 4.52 (m, 2H), 3.51 (m,4H), 3.23 (m, 4H), 2.72 (m, 6H), 1.89 (m, 2H), 1.56 (m, 2H); ESI MS m/z421 [M+H]⁺.

Example 107 Preparation of(4-(3,4-Difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(piperazine-1-carbonyl)-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone(169)

Step A: A solution of tert-butyl piperazine-1-carboxylate (210 mg, 1.13mmol) and pyridine (137 mg, 1.73 mmol) in anhydrous CH₂Cl₂ (2 mL) wascooled to 0° C. under an atmosphere of N₂, treated with a solution oftriphosgene (402 mg, 1.35 mmol) in anhydrous CH₂Cl₂ (2 mL) and stirredat 0° C. for 1 h. The cooling bath was then removed and the reactionstirred at room temperature for a further 1 h. After this time, themixture was diluted with 1 M hydrochloric acid (25 mL) and extractedwith CH₂Cl₂ (3×20 mL). The combined organic extracts were washed withbrine (20 mL), dried over Na₂SO₄ and the drying agent removed byfiltration. The filtrate was concentrated to dryness under reducedpressure to provide tert-butyl4-(chlorocarbonyl)piperazine-1-carboxylate as a white solid (280 mg,100%): ¹H NMR (500 MHz, CDCl₃) δ 10.76 (br s, 1H), 7.33 (dd, J=17.0, 9.0Hz, 1H), 7.11 (dd, J=9.0, 4.0 Hz, 1H), 4.88-4.52 (m, 2H), 4.69 (br s,2H), 4.62 (s, 2H), 3.49 (apparent t, J=4.5 Hz, 4H), 3.32 (apparent t,J=4.5 Hz, 4H), 3.25 (apparent t, J=12.5 Hz, 1H), 3.14-2.88 (m, 2H), 1.94(d, J=12.5 Hz, 2H), 1.72-1.66 (m, 2H), 1.48 (s, 9H).

Step B: A solution of(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanone hydrochloride salt (50 mg, 0.11 mmol),N,N,N-diisopropylethylamine (0.05 mL, 0.3 mmol) and DMAP (0.5 mg, 0.004mmol) in anhydrous CH₂Cl₂ (1 mL) was cooled to 0° C. under an atmosphereof N₂, treated with tert-butyl4-(chlorocarbonyl)piperazine-1-carboxylate (30 mg, 0.12 mmol) andstirred at 0° C. for 1 h. The cooling bath was then removed and thereaction stirred at room temperature for a further 4 h. After this time,the mixture was chromatographed over silica gel (Isco CombiFlash Rfunit, 12 g Redisep gold column, 0% to 10% CH₃OH in CH₂Cl₂) to providetert-butyl4-(3-(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidine-1-carbonyl)-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazole-5-carbonyl)piperazine-1-carboxylateas a white solid (48 mg, 71%): ¹H NMR (500 MHz, CDCl₃) δ 10.76 (br s,1H), 7.33 (dd, J=17.0, 9.0 Hz, 1H), 7.11 (dd, J=9.0, 4.0 Hz, 1H),4.88-4.52 (m, 2H), 4.69 (br s, 2H), 4.62 (s, 2H), 3.49 (apparent t,J=4.5 Hz, 4H), 3.32 (apparent t, J=4.5 Hz, 4H), 3.25 (apparent t, J=12.5Hz, 1H), 3.14-2.88 (m, 2H), 1.94 (d, J=12.5 Hz, 2H), 1.72-1.66 (m, 2H),1.48 (s, 9H).

Step C: A solution of tert-butyl4-(3-(4-(3,4-difluoro-2-(trifluoro-methyl)phenyl)piperidine-1-carbonyl)-1,4,5,6-tetrahydro-pyrrolo[3,4-c]pyrazole-5-carbonyl)piperazine-1-carboxylate(47 mg, 0.077 mmol) in anhydrous CH₂Cl₂ (1.5 mL) was cooled to 0° C.under an atmosphere of N₂ and treated with TFA (1.5 mL). When theaddition was complete, the cooling bath was removed and the reactionstirred at room temperature for 1 h. After this time, the mixture wasconcentrated to dryness under reduced pressure, diluted in CH₂Cl₂ (100mL) and washed with 2 M aqueous NaOH (2×50 mL). The organic layer wasdried over Na₂SO₄ and the drying agent removed by filtration. Thefiltrate was concentrated to dryness under reduced pressure and theresulting residue chromatographed over silica gel (Isco CombiFlash Rfunit, 120 g Redisep column, 0% to 40% CH₃OH in CH₂Cl₂). The combinedcolumn fractions were concentrated to dryness under reduced pressure andfound to contain residual TFA (˜17%). The resulting residue (21 mg) wasdiluted in a mixture of CH₂Cl₂ (5 mL) and CH₃OH (1 mL), treated withMP-carbonate and stirred at room temperature for 2 h. After this timethe mixture was filtered and the filtrate concentrated to dryness underreduced pressure to provide(4-(3,4-difluoro-2-(trifluoromethyl)phenyl)piperidin-1-yl)(5-(piperazine-1-carbonyl)-1,4,5,6-tetrahydropyrrolo[3,4-c]pyrazol-3-yl)methanoneas a white solid (13 mg, 33%): mp 153-155° C.; ¹H NMR (500 MHz, DMSO-d₆)δ 13.20 (br s, 1H), 7.75 (dd, J=18.0, 9.0 Hz, 1H), 7.55-7.52 (m, 1H),4.65-4.51 (m, 6H), 3.24-3.22 (m, 2H), 3.14 (t, J=5.0 Hz, 4H), 2.96-2.80(m, 1H), 2.70-2.68 (m, 3H), 2.32-2.22 (m, 1H), 1.79-1.70 (m, 4H), 1proton not readily observed; ESI MS m/z 513 [M+H].

Example 108 RPB4 Binding of Substituted Piperidine Compounds

The compounds listed in Table 1 were tested in two in vitro assays, RBP4binding (SPA) and retinol-dependent RBP4-TTR interaction (HTRF). Thecompounds binded to RBP4 and/or antagonized retinol-dependent RBP4-TTRinteraction (Table 2). This activity indicated that the compounds reducethe levels of serum RBP4 and retinol.

TABLE 1 Compound Structure 30

32

34

36

38

40

42

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

77

78

79

80

81

82

83

84

85

86

87

88

89

90

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

TABLE 2 HTRF assay for SPA binding assay antagonists of RBP4-TTRCompound for RBP4: IC₅₀ (μM) interaction: IC₅₀ (μM) 30 0.013325680.04412238 32 0.062512598 0.244123897 34 0.020741511 0.053147107 360.010869769 0.291188749 38 0.026852208 0.200234283 40 0.0140372210.084919195 42 0.424157125 0.791241375 63 0.004456853 0.015959612 640.00535572 0.020583279 65 0.004128382 0.012791498 65 0.009208490.012699602 65 0.005731617 0.016052657 65 0.005362759 0.012698298 660.0075 0.0823 67 0.0083091 0.040819847 68 <0.001371742 0.036226752 690.010003069 0.026712607 70 0.016423974 0.037469294 71 0.0170681160.052577032 72 0.010783633 0.052816869 73 0.008501059 0.030581957 740.011554458 0.028341348 75 0.006948729 0.033963112 76 0.0073973370.019662328 77 0.007956596 0.010567139 77 0.002879752 0.001618692 780.009495365 0.015829707 79 0.004345412 0.006097083 80 0.0091163220.04059294 81 0.006035222 0.013874989 81 0.005257865 0.009751259 810.002824087 — 81 0.004328733 0.014982801 82 0.011621066 0.030784872 830.011621066 0.030784872 83 <0.001371742 0.004846177 84 0.0162785790.014718925 85 0.017878562 0.022412347 86 0.019348437 0.027773785 870.009458663 0.022161242 87 0.007802201 0.016361021 88 0.0146540270.017992866 88 0.01343769 0.039000351 89 0.008837608 0.033041159 900.014355632 0.042917759 91 0.007058195 0.057659098 92 0.0102168260.076562958 93 0.008001007 0.033595702 94 0.006956733 0.049907081 950.007780441 0.027841767 96 0.012671283 0.026498126 97 0.0143251850.023974449 98 0.011849477 0.07412655 99 0.022481673 0.147330955 1000.019623326 0.030307008 101 0.007438315 0.014065248 102 0.0216642040.027581659 103 0.01602771 0.03032762 104 0.018923149 0.021764444 1050.0111956 0.036352539 106 0.020392347 0.029763871 107 0.0233938350.07700471 108 0.025170865 0.049536156 109 0.014933765 0.04188677 1100.015640938 0.015420503 111 0.00688552 0.022103363 112 0.0114822190.027454866 113 0.008568525 0.029698246 114 0.010291162 0.040803422 1150.018874475 0.109320347 116 0.011433337 0.023664257 117 0.0054808920.037691094 118 0.009387053 0.014204672 119 0.010706312 0.039428773 1200.003446949 0.021028771 121 0.008840985 0.031786798 122 0.0170489190.027657766 123 0.015052917 0.052167868 124 0.014625984 0.024895781 1250.014989926 0.062101253 126 0.016994001 0.16972172 127 0.0158763570.017030219 128 0.018381483 0.032415479 129 0.013783057 0.019545743 1300.012836331 0.01491032 131 0.006360993 0.010914335 132 0.0067504110.010485373 133 — — 134 0.0172 0.0955 135 0.016415973 0.021040669 1360.016716286 0.012001451 137 0.018357352 0.02416484 138 0.0101248560.02443067 139 0.017844788 0.022818173 140 0.009283295 0.021890308 1410.005244084 0.020757101 142 0.004882652 0.023217801 143 0.0088307970.052292371 144 0.006170928 0.070312083 145 0.007565936 0.066971574 1460.015873944 0.036497073 147 0.017087987 0.025510325 148 0.0051211820.007411947 148 <0.001371742 <0.000169 149 0.005905695 0.023421638 1500.004841961 0.023730312 151 0.010266809 0.067747522 152 0.0031041180.027843193 153 0.149436555 0.833441155 154 0.150196791 0.384932114 1550.02162571 0.186360166 156 0.01944249 0.247762562 157 0.0058405610.09202995 158 0.008632683 0.036829287 159 0.008056546 0.052280303 1600.009062711 0.019772679 161 0.005742747 0.025784179 162 0.004824770.01068914 163 0.015294165 0.055271368 164 0.013574829 0.074955125 1650.01557141 0.064787312 166 0.012173811 0.037917945 167 0.0117159620.048822888 168 0.015544906 0.081261949 169 0.033042848 0.055813322

Example 109 RPB4 Binding of Additional Substituted Piperidine Compounds

An additional aspect of the invention provides analogs of the compoundsof Table 1 that are active as RBP4 antagonists. These analogs contain adi- or tri-substituted phenyl ring located at the 4-position of thepiperidine core. The analogs of Compounds 63-162 described hereinanalogously bind to RBP4 and antagonize retinol-dependent RBP4-TTRinteraction.

Additional piperidine compounds, which are analogs of those described inTable 1, are tested in two in vitro assays, RBP4 binding (SPA) andretinol-dependent RBP4-TTR interaction (HTRF). These piperidinecompounds bind to RBP4 and antagonize retinol-dependent RBP4-TTRinteraction. This activity indicates that the compounds reduce the levelof serum RBP4 and retinol.

Example 110 Efficacy in a Mammalian Model

The effectiveness of the compounds listed in Table 1 are tested inwild-type and Abca4−/− mice. The Abca4−/− mouse model manifestsaccelerated accumulation of lipofuscin in the RPE and is considered apre-clinical efficacy model for a drug reducing lipofuscin accumulation.Compounds are orally dosed for 3 weeks at 30 mg/kg. There is a reductionin the serum RBP4 level in treated animals. The levels of A2E/isoA2E andother bisretinoids are reduced in treated mice. The levels of A2-DHP-PEand atRAL di-PE are also reduced.

The effectiveness of additional piperidine compounds, which are analogsof those described in Table 1, are tested in wild-type and Abca4−/−mice. The Abca4−/− mouse model manifests accelerated accumulation oflipofuscin in the RPE and is considered a pre-clinical efficacy modelfor a drug reducing lipofuscin accumulation. Compounds are orally dosedfor 3 weeks at 30 mg/kg. There is a reduction in the serum RBP4 level intreated animals. The levels of A2E/isoA2E and other bisretinoids arereduced in treated mice. The levels of A2-DHP-PE and atRAL di-PE arealso reduced.

Example 111 Efficacy of Compound 81 in a Mammalian Model

Compound 81 inhibited bisretinoid accumulation in Abca4−/− mouse model.Abca4−/− mice have A2E levels in the ˜15-19 pmoles/eye range at 17 weeksold. Mice, starting at 17 weeks old, were treated with 25 mg/kg ofCompound 81 for 12 weeks. There was a 53% reduction in bisretinoidcontent in the Compound 81-treated mice versus the vehicle-treatedcontrols (FIG. 8). This data was consistent with complete arrest ofbisretinoid synthesis from the start of the dosing regiment. Reducedbisretinoid accumulation resulted in significant serum RBP4 reduction inthe Compound 81-treated mice (FIG. 9).

Example 112 Efficacy of Additional Compounds in a Mammalian Model

Compounds 34, 36, and 38 inhibit bisretinoid accumulation in Abca4−/−mouse model. Mice, starting at 17 weeks old, are treated with 25 mg/kgof Compounds 34, 36, or 38 for 12 weeks. There is a reduction inbisretinoid content in the treated mice versus the vehicle-treatedcontrols. This data is consistent with complete arrest of bisretinoidsynthesis from the start of the dosing regiment. Reduced bisretinoidaccumulation results in significant serum RBP4 reduction in the treatedmice.

Compounds 30, 40, and 42 inhibit bisretinoid accumulation in Abca4−/−mouse model. Mice, starting at 17 weeks old, are treated with 25 mg/kgof Compounds 30, 40, or 42 for 12 weeks. There is a reduction inbisretinoid content in the treated mice versus the vehicle-treatedcontrols. This data is consistent with complete arrest of bisretinoidsynthesis from the start of the dosing regiment. Reduced bisretinoidaccumulation results in significant serum RBP4 reduction in the treatedmice.

Each of Compounds 63-80 or 82-169 inhibit bisretinoid accumulation inAbca4−/− mouse model. Mice, starting at 17 weeks old, are treated with25 mg/kg any one of Compounds 63-80 or 82-169 for 12 weeks. There is areduction in bisretinoid content in the treated mice versus thevehicle-treated controls. This data is consistent with complete arrestof bisretinoid synthesis from the start of the dosing regiment.

Reduced bisretinoid accumulation results in significant serum RBP4reduction in the treated mice.

Example 113 Administration to a Subject

An amount of a compound 81 is administered to the eye of a subjectafflicted with AMD. The amount of the compound is effective to treat thesubject.

An amount of a compound 81 is administered to the eye of a subjectafflicted with Stargardt disease. The amount of the compound iseffective to treat the subject.

An amount of any one of compounds 63-80 or 82-169 is administered to theeye of a subject afflicted with AMD. The amount of the compound iseffective to treat the subject.

An amount of any one of compounds 63-80 or 82-169 is administered to theeye of a subject afflicted with Stargardt disease. The amount of thecompound is effective to treat the subject.

DISCUSSION

Age-related macular degeneration (AMD) is the leading cause of blindnessin developed countries. Its prevalence is higher than that ofAlzheimer's disease. There is no treatment for the most common dry formof AMD. Dry AMD is triggered by abnormalities in the retinal pigmentepithelium (RPE) that lies beneath the photoreceptor cells and providescritical metabolic support to these light-sensing cells. RPE dysfunctioninduces secondary degeneration of photoreceptors in the central part ofthe retina called the macula. Experimental data indicate that highlevels of lipofuscin induce degeneration of RPE and the adjacentphotoreceptors in atrophic AMD retinas. In addition to AMD, dramaticaccumulation of lipofuscin is the hallmark of Stargardt's disease(STGD), an inherited form of juvenile onset macular degeneration. Themajor cytotoxic component of RPE lipofuscin is a pyridinium bisretinoidA2E. A2E formation occurs in the retina in a non-enzymatic manner andcan be considered a by-product of a properly functioning visual cycle.Given the established cytotoxic affects of A2E on RPE andphotoreceptors, inhibition of A2E formation could lead to delay invisual loss in patients with dry AMD and STGD. It was suggested thatsmall molecule visual cycle inhibitors may reduce the formation of A2Ein the retina and prolong RPE and photoreceptor survival in patientswith dry AMD and STGD. Rates of the visual cycle and A2E production inthe retina depend on the influx of all-trans retinol from serum to theRPE. RPE retinol uptake depends on serum retinol concentrations.Pharmacological downregulation of serum retinol is a valid treatmentstrategy for dry AMD and STGD. Serum retinol is maintained incirculation as a tertiary complex with retinol-binding protein (RBP4)and transthyretin (TTR). Without interacting with TTR, the RBP4-retinolcomplex is rapidly cleared due to glomerular filtration. Retinol bindingto RBP4 is required for formation of the RBP4-TTR complex; apo-RBP4 doesnot interact with TTR. Importantly, the retinol-binding site on RBP4 issterically proximal to the interface mediating the RBP4-TTR interaction.Without wishing to be bound by any scientific theory, the data hereinshow that small molecule RBP4 antagonists displacing retinol from RBP4and disrupting the RBP4-TTR interaction will reduce serum retinolconcentration, inhibit retinol uptake into the retina and act asindirect visual cycle inhibitors reducing formation of cytotoxic A2E.

Serum RBP4 as a Drug Target for Pharmacological Inhibition of the VisualCycle

As rates of the visual cycle and A2E production in the retina depend onthe influx of all-trans retinol from serum to the RPE (FIG. 4), it hasbeen suggested that partial pharmacological down-regulation of serumretinol may represent a target area in dry AMD treatment (11). Serumretinol is bound to retinol-binding protein (RBP4) and maintained incirculation as a tertiary complex with RBP4 and transthyretin (TTR)(FIG. 5). Without interacting with TTR, the RBP4-retinol complex israpidly cleared from circulation due to glomerular filtration.Additionally, formation of the RBP4-TTR-retinol complex is required forreceptor-mediated all-trans retinol uptake from serum to the retina.

Without wishing to be bound by any scientific theory, visual cycleinhibitors may reduce the formation of toxic bisretinoids and prolongRPE and photoreceptor survival in dry AMD. Rates of the visual cycle andA2E production depend on the influx of all-trans retinol from serum tothe RPE. Formation of the tertiary retinol-binding protein 4(RBP4)-transthyretin (TTR)-retinol complex in serum is required forretinol uptake from circulation to the RPE. Retinol-binding site on RBP4is sterically proximal to the interface mediating the RBP4-TTRinteraction. RBP4 antagonists that compete with serum retinol forbinding to RBP4 while blocking the RBP4-TTR interaction would reduceserum retinol, slow down the visual cycle, and inhibit formation ofcytotoxic bisretinoids.

RBP4 represents an attractive drug target for indirect pharmacologicalinhibition of the visual cycle and A2E formation. The retinol-bindingsite on RBP4 is sterically proximal to the interface mediating theRBP4-TTR interaction. Retinol antagonists competing with serum retinolfor binding to RBP4 while blocking the RBP4-TTR interaction would reduceserum RBP4 and retinol levels which would lead to reduced uptake ofretinol to the retina. The outcome would be visual cycle inhibition withsubsequent reduction in the A2E synthesis.

A synthetic retinoid called fenretinide [N-(4-hydroxy-phenyl)retinamide,4HRP](FIG. 6) previously considered as a cancer treatment (29) was foundto bind to RBP4, displace all-trans retinol from RBP4 (13), and disruptthe RBP4-TTR interaction (13,14).

Fenretinide was shown to reduce serum RBP4 and retinol (15), inhibitocular all-trans retinol uptake and slow down the visual cycle (11).Importantly, fenretinide administration reduced A2E production in ananimal model of excessive bisretinoid accumulation, Abca4−/− mice (11).Pre-clinical experiments with fenretinide validated RBP4 as a drugtarget for dry AMD. However, fenretinide is non-selective and toxic.Independent of its activity as an antagonist of retinol binding to RBP4,fenretinide is an extremely active inducer of apoptosis in many celltypes (16-19), including the retinal pigment epithelium cells (20). Ithas been suggested that fenretinide's adverse effects are mediated byits action as a ligand of a nuclear receptor RAR (21-24). Additionally,similar to other retinoids, fenretinide is reported to stimulateformation of hemangiosarcomas in mice. Moreover, fenretinide isteratogenic, which makes its use problematic in Stargardt diseasepatients of childbearing age.

As fenretinide's safety profile may be incompatible with long-termdosing in individuals with blinding but non-life threatening conditions,identification of new classes of RBP4 antagonists is of significantimportance. The compounds of the present invention displace retinol fromRBP4, disrupt retinol-induced RBP4-TTR interaction, and reduce serumREBP4 levels. The compounds of the present invention inhibit bisretinoidaccumulation in the Abca4−/− mouse model of excessive lipofuscinogenesiswhich indicates usefulness a treatment for dry AMD and Stargardtdisease.

The present invention relates to small molecules for treatment ofmacular degeneration and Stargardt Disease. Disclosed herein is theophthalmic use of the small molecules as non-retinoid RBP4 antagonists.The compound listed in Table 2 have been shown to bind RBP4 in vitroand/or to antagonize RBP4-TTR interaction in vitro at biologicallysignificant concentrations. Additional compounds described herein, whichare analogs of compound listed in Table 2 analogously bind RBP4 in vitroand antagonize RBP4-TTR interaction in vitro at biologically significantconcentrations.

Currently, there is no FDA-approved treatment for dry AMD or Stargardtdisease, which affects millions of patients. An over the counter, nonFDA-approved cocktail of antioxidant vitamins and zinc (AREDS formula)is claimed to be beneficial in a subset of dry AMD patients. There areno treatments for Stargardt disease. The present invention identifiednon-retinoid RBP4 antagonists that are useful for the treatment of dryAMD and other conditions characterized by excessive accumulation oflipofuscin. Without wishing to be bound by any scientific theory, asaccumulation of lipofuscin seems to be a direct cause of RPE andphotoreceptor demise in AMD and STGD retina, the compounds describedherein are disease-modifying agents since they directly address the rootcause of these diseases. The present invention provides novel methods oftreatment that will preserve vision in AMD and Stargardt diseasepatients, and patients' suffering from conditions characterized byexcessive accumulation of lipofuscin.

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1. A compound having the structure:

wherein R₁, R₂, R₃, R₄, and R₅ are each independently H, halogen, CF₃ orC₁-C₄ alkyl, wherein two or more of R₁, R₂, R₃, R₄, or R₅ are other thanH; R₆ is H, OH, or halogen; and B is a substituted or unsubstitutedheterobicycle, wherein when R₁ is CF₃, R₂ is H, R₃ is F, R₄ is H, and R₅is H, or R₁ is H, R₂ is CF₃, R₃ is H, R₄ is CF₃, and R₅ is H, or R₁ isCl, R₂ is H, R₃ is H, R₄ is F, and R₅ is H, or R₁ is CF₃, R₂ is H, R₃ isF, R₄ is H, and R₅ is H, or R₁ is CF₃, R₂ is F, R₃ is H, R₄ is H, and R₅is H, or R₁ is Cl, R₂ is F, R₃ is H, R₄ is H, and R₅ is H, then B isother than

or a pharmaceutically acceptable salt thereof.
 2. The compound of claim1, wherein when R₁ is CF₃, R₂ is H, R₃ is F, R₄ is H, and R₅ is H, or R₁is H, R₂ is CF₃, R₃ is H, R₄ is CF₃, and R₅ is H, or R₁ is Cl, R₂ is H,R₃ is H, R₄ is F, and R₅ is H, or R₁ is CF₃, R₂ is H, R₃ is F, R₄ is H,and R₅ is H, or R₁ is CF₃, R₂ is F, R₃ is H, R₄ is H, and R₅ is H, or R₁is Cl, R₂ is F, R₃ is H, R₄ is H, and R₅ is H, then B is other than

or a pharmaceutically acceptable salt thereof.
 3. (canceled) 4.(canceled)
 5. The compound of claim 1, wherein R₁ is CF₃, R₂ is F, R₃ isF, R₄ is H, and R₅ is H, or R₁ is CF₃, R₂ is F, R₃ is H, R₄ is H, and R₅is H, or R₁ is CF₃, R₂ is F, R₃ is H, R₄ is F, and R₅ is H, or R₁ isCF₃, R₂ is H, R₃ is F, R₄ is F, and R₅ is H, Or R₁ is CF₃, R₂ is H, R₃is H, R₄ is H, and R₅ is F, or R₁ is CF₃, R₂ is H, R₃ is F, R₄ is H, andR₅ is H, or R₁ is CF₃, R₂ is H, R₃ is H, R₄ is Cl, and R₅ is H, or R₁ isCF₃, R₂ is Cl, R₃ is H, R₄ is H, and R₅ is H, or R₁ is H, R₂ is CF₃, R₃is H, R₄ is CF₃, and R₅ is H, or R₁ is Cl, R₂ is H, R₃ is H, R₄ is F,and R₅ is H, or R₁ is Cl, R₂ is F, R₃ is H, R₄ is H, and R₅ is H.
 6. Thecompound of claim 1, wherein B has the structure:

wherein α, β, χ, and δ are each independently absent or present, andwhen present each is a bond; X is C or N; Z₁ is N; Z₂ is N or NR₇,wherein R₇ is H, C₁-C₄ alkyl, or oxetane; Q is a substituted orunsubstituted 5, 6, or 7 membered ring structure.
 7. The compound ofclaim 6, wherein B has the structure:

wherein when α is present, then Z₁ and Z₂ are N, X is N, β is present,and χ and δ are absent; and when α is absent, then Z₁ is N, Z₂ is N—R₇,X is C, β and δ are present, and χ is absent.
 8. The compound of claim7, wherein B has the structure:

wherein n is an integer from 0-2; α, β, χ, δ, ε, and φ are eachindependently absent or present, and when present each is a bond; Z₁ isN; Z₂ is N or N—R₇, wherein R₇ is H, C₁-C₁₀ alkyl, or oxetane; X is C orN; and Y₁, Y₂, Y₃, and each occurrence of Y, are each independently CR₅,CH₂, or N—R₅, wherein R₈ is H, halogen, OCH₃, CN, or CF₃; and R₉ is H,CN, oxetane, C₁-C₆ alkyl, C₃-C₆ cycloalkyl, (C₁-C₄ alkyl)(C₃-C₆cycloalkyl), (C₁-C₆ alkyl)-OCH₃, (C₁-C₆ alkyl)-CF₃, C(O)—(C₁-C₆ alkyl),C(O)₂—(C₁-C₆ alkyl), C(O)—NH₂C(O)NH—(C₁-C₆ alkyl), C(O)—(C₆ aryl),C(O)—(C₆ heteroaryl), C(O)-pyrrolidine, C(O)-piperidine,C(O)-piperazine, (C₁-C₆ alkyl)-CO₂H, (C₁-C₆ alkyl)-CO₂(C₁-C₆ alkyl) orSO₂—(C₁-C₆ alkyl).
 9. The compound of claim 8, wherein B has thestructure:

wherein n is 0; R₇ is H, C₁-C₄ alkyl, or oxetane; Y₁ and Y₃ are eachCH₂; and Y₂ is N—R₉, wherein R₉ is H, CN, oxetane, C₁-C₆ alkyl, C₃-C₆cycloalkyl, (C₁-C₄ alkyl)(C₃-C₆ cycloalkyl), (C₁-C₆ alkyl)-OCH₃, (C₁-C₆alkyl)-CF₃, C(O)—(C₁-C₆ alkyl), C(O)₂—(C₁-C₆ alkyl),C(O)—NH₂C(O)NH—(C₁-C₆ alkyl), C(O)—(C₆ aryl), C(O)—(C₆ heteroaryl),C(O)-pyrrolidine, C(O)-piperidine, C(O)-piperazine, (C₁-C₆ alkyl)-CO₂H,(C₁-C₆ alkyl)-CO₂(C₁-C₆ alkyl) or SO₂—(C₁-C₆ alkyl); or B has thestructure:

wherein n is 1; R₇ is H, C₁-C₄ alkyl, or oxetane; Y₁, Y₂ and Y₄ are eachCH₂; and Y₃ is N—R₉, wherein R₉ is H, CN, oxetane, C₁-C₆ alkyl, C₃-C₆cycloalkyl, (C₁-C₄ alkyl)(C₃-C₆ cycloalkyl), (C₁-C₆ alkyl)-OCH₃, (C₁-C₆alkyl)-CF₃, C(O)—(C₁-C₆ alkyl), C(O)₂—(C₁-C₆ alkyl),C(O)—NH₂C(O)NH—(C₁-C₆ alkyl), C(O)—(C₆ aryl), C(O)—(C₆ heteroaryl),C(O)-pyrrolidine, C(O)-piperidine, C(O)-piperazine, (C₁-C₆ alkyl)-CO₂H,(C₁-C₆ alkyl)-CO₂(C₁-C₆ alkyl) or SO₂—(C₁-C₆ alkyl); or B has thestructure:

wherein n is 1; R₇ is H, C₁-C₄ alkyl, or oxetane; Y₁, Y₃ and Y₄ are eachCH₂; and Y₂ is N—R₉, wherein R₉ is H, CN, oxetane, C₁-C₆ alkyl, C₃-C₆cycloalkyl, (C₁-C₄ alkyl)(C₃-C₆ cycloalkyl), (C₁-C₆ alkyl)-OCH₃, (C₁-C₆alkyl)-CF₃, C(O)—(C₁-C₆ alkyl), C(O)₂—(C₁-C₆ alkyl),C(O)—NH₂C(O)NH—(C₁-C₆ alkyl), C(O)—(C₆ aryl), C(O)—(C₆ heteroaryl),C(O)-pyrrolidine, C(O)-piperidine, C(O)-piperazine, (C₁-C₆ alkyl)-CO₂H,(C₁-C₆ alkyl)-CO₂(C₁-C₆ alkyl) or SO₂—(C₁-C₆ alkyl).
 10. (canceled) 11.(canceled)
 12. The compound of claim 9, wherein B has the structure:


13. The compound of claim 12, wherein R₉ is H, CN, CH₃, CH₂CH₃,CH₂CH₂CH₃, CH(CH₃)₂, CH₂CH(CH₃)₂, t-Bu, CH₂CH(CH₃)₂, CH₂C(CH₃)₃, CH₂CF₃,CH₂CH₂CF₃, CH₂OCH₃, CH₂CH₂OCH₃,

SO₂—CH₃, C(O)—CH₃, C(O)—CH₂CH₃, C(O)—CH₂CH₂CH₃, C(O)—CH(CH₃)₂,C(O)—CH₂CH(CH₃)₂, C(O)-t-Bu, C(O)—OCH₃, C(O)—NHCH₃,


14. (canceled)
 15. The compound of claim 9, wherein R₇ is H, CH₃,CH₂CH₃, CH(CH₃)₂, or


16. The compound of claim 8, wherein B has the structure:

wherein Y₁, Y₂, Y₃ and Y₄ are each independently CR₈ or N, wherein eachR₆ is independently H, halogen, OCH₃, CN, or CF₃.
 17. The compound ofclaim 16, wherein B has the structure:

wherein each R₅ is CN or OCH₃.
 18. (canceled)
 19. The compound of claim13 having the structure:

or a pharmaceutically acceptable salt of the compound.
 20. The compoundof claim 17 having the structure:

or a pharmaceutically acceptable salt of the compound.
 21. The compoundof claim 1 having the structure:

or a pharmaceutically acceptable salt of the compound.
 22. Apharmaceutical composition comprising the compound of claim 1 and apharmaceutically acceptable carrier.
 23. A method for treating a diseasecharacterized by excessive lipofuscin accumulation in the retina in asubject afflicted therewith comprising administering to the subject aneffective amount of a compound of claim
 1. 24. (canceled)
 25. The methodof claim 23, wherein the amount of the compound is effective to lowerthe serum concentration of RBP4 in the subject or to lower the retinalconcentration of a bisretinoid in lipofuscin in the subject. 26.(canceled)
 27. The method of claim 25, wherein the bisretinoid is A2E,isoA2E, A2-DHP-PE, or atRAL di-PE. 28-30. (canceled)
 31. The method ofclaims 23-30, wherein the disease characterized by excessive lipofuscinaccumulation in the retina is Age-Related Macular Degeneration, dry(atrophic) Age-Related Macular Degeneration, Stargardt Disease, Bestdisease, adult vitelliform maculopathy or Stargardt-like maculardystrophy. 32-38. (canceled)